Item no.

: T60404-N4641-X836
Specification
VACU UM SCH M ELZE

Differential Current Sensor for EV-charging Date: 03.12.2024

acc. to the partly combined standards
IEC62955-1:2018 and UL2231-2 Ed.2
K-No.:30626
Customer: Standard type Page 1 of 12
Description Characteristics Applications
Fluxgate current sensor with Excellent accuracy Mainly used for stationary and mobile
toroidal core Switching open-collector outputs applications:
PCB mounting Compact design Wallbox
Personnel Protection Systems
Patents: EP2571128 / US9397494 / CN103001175 // EP2813856 for EV acc. to UL2231
Electrical data Ratings min. typ. max. Unit
IP Primary nominal RMS current (1phase / 3phase) 80 / 40 A
I Rated residual operating current 1 6 mA dc
I Rated residual operating current 2 20 mA rms
I Trip tolerance 1 4 5 6 mA dc
I , tolerance Trip tolerance 2 15 20(1) / 70(2) mA rms
Recovery Current level for I
I Rl,1 (Fig.3) 2.5 mA
(absolute value DC)
Recovery Current level for I
I Rl,2 (Fig.3) 10 mA
(absolute value rms)
(1) f = 50/60 Hz (2) f = DC to 2kHz

Accuracy Dynamic performance data

I N,max Max. measuring range (peak) -300 +300 mA
X Resolution (@ I N, A = 25°C) < 0.2 mA
tr Response time(3) see Fig.2
fBW (Fig.5) Frequency range DC 2 kHz
General data
A Ambient operation temperature -40 85 °C
Storage Ambient storage temperature -40 85 °C
m Mass 21 g
VCC Supply voltage 4.8 5 5.2 V DC
ICC Supply current 33 mA rms
Sclear, pp Clearance (primary to secondary)(4) 8mm
Screep, pp Creepage (primary to secondary) (4) 8mm
FIT EN/IEC 61709 / SN 29500 (5) < 2200 fit
(3)
Switching time of a relay (IEC: t = 20ms / UL: t = 10ms) is considered.
(4)
Constructed, manufactured and tested in accordance with IEC60664-1:2020
Isolated wires are preferred to fulfill the insulation coordination acc. to IEC 62955:2018, it is necessary to use insulated primary conductors that
meet the requirements of the basic insulation for the rated voltage. If isolated primary conductors are used, the isolation coordination is acc. to:
Reinforced insulation, Insulation material group 1, Pollution degree 2 and overvoltage category III.
(5)
The results are valid under following conditions: 55°C mean component ambient temperature by continuous operation (8760h per year);
Environment condition: ground mobile, no dust or harmful substances, according to IEC61709; Fit equals one failure per 10^9 component hours

General description of sensor function:

The Sensor is sensitive to AC and DC current and can be used for fault current detection in EV-charging
applications. The Sensor detects DC fault currents according to IEC62955:2018 and AC/DC fault currents
according to UL2231-2 Ed.2. In the event of a 6mAdc fault current, PIN 7 will change its state from a low level
(GND) to high impedance state. In the event of a 20mArms fault current, PIN 6 will change state from a low level
(GND) to a high impedance state. Pin 7 only fulfills the switch-off characteristic of the IEC62955 standard
(monitoring the dc fault current). An additional driver-circuit must be used for driving a load switch or circuit
breaker as defined in IEC62955 / UL2231 as applicable.

Datum Name Index Änderung

03.12.2024 SF 81 UL-Logo added to marking CN-24-67

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 Item no.: T60404-N4641-X836
Specification
VACU UM SCH M ELZE

Differential Current Sensor for EV-charging Date: 03.12.2024

acc. to the partly combined standards
IEC62955-1:2018 and UL2231-2 Ed.2
K-No.:30626
Customer: Standard type Page 2 of 12
Mechanical outline (mm): General tolerances DIN ISO 2768-c
Connections:

PIN no. 1-8: 0.46mm x 0.46mm

PIN no. 9-12: 0.7mm x 0.7mm

Marking:
UL-
Sign 4641-X836
F DC

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 Item no.: T60404-N4641-X836
Specification
VACU UM SCH M ELZE

Differential Current Sensor for EV-charging Date: 03.12.2024

acc. to the partly combined standards
IEC62955-1:2018 and UL2231-2 Ed.2
K-No.:30626
Customer: Standard type Page 3 of 12
PIN description:

PIN no. Description

PIN 1 VCC Positive supply voltage
PIN 2 GND Ground connection
UART Interface Transmit Data (see Chapter
PIN 3 TxD
(UART )
UART Interface Receive Data
2nd function (Test via internal microcontroller): A function test including
an offset measurement is activated if this PIN is connected to GND for a
period of 40ms to 1.2s. If the PIN is set to GND less than 40ms or more
than 1.2s, no function test will be performed, see timing diagram (fig. 3).
Attention: During the functional test and offset
measurement, no differential current may flow. UART
PIN 4 RxD-T interface is a diagnostic interface and is not suitable for
activating protective measures against electric shock
(disconnection of the monitored circuit).
To ensure high accuracy of the sensor this test should be activated at
regular intervals (e.g.
If a push-
UART )
Drive Enable for Serial communication transceivers.
Pin 5 DE
For Typical Application it is left open.
X20 switches in acc. to UL2231 (CCID20 requirements) and no system
PIN 6 X20-OUT (open collector output) fault occurs the output on PIN 6 is a low level (GND). In any other case
PIN 6 is in a high impedance state (see tab. 1).
X6 switches in acc. to IEC62955 requirements and no system fault
PIN 7 X6-OUT (open collector output) occurs the output on PIN 7 is a low level (GND). In any other case PIN
7 is in a high impedance state. (see tab. 1).
Test winding N=25 (max. ratings 5 mA) Test winding is internally
PIN 8 T-W
connected to VCC. (see fig. 1)

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 Item no.: T60404-N4641-X836
Specification
VACU UM SCH M ELZE

Differential Current Sensor for EV-charging Date: 03.12.2024

acc. to the partly combined standards
IEC62955-1:2018 and UL2231-2 Ed.2
K-No.:30626
Customer: Standard type Page 4 of 12
Typical application diagram:

Fig. 1: Single sensor configuration without using UART

The sensor can be used without UART Interface. In this case a functional test is carried out by a LOW level
signal on terminal RxD-T (acc. timing diagram fig. 3). It is essential to perform a sensor test regularly for
proofability of the sensors function correctly.
Figure 3 explains the timing of the functional test via terminal RxD-T. The sensor generates a suitable internal
test current to test the tripping levels for the output X6-OUT and X20-OUT (acc. timing diagram fig. 3).

The function of the sensor can also be tested using the test winding. Internally, the test winding is connected
to Vcc. With an external switch to pin T-W the test current can be applied, a resistor (RT) in series to the
switch and T-W limits the current to the test winding. If the RT resistor is not installed, a short circuit occurs
across the test winding, which destroys the sensor. To keep the max ratings of 5 mA a 1k Ohm resistor
should be installed. The test current of 125 mA is then obtained through the turns ratio of N = 25.

Current can calculated by:

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 Item no.: T60404-N4641-X836
Specification
VACU UM SCH M ELZE

Differential Current Sensor for EV-charging Date: 03.12.2024

acc. to the partly combined standards
IEC62955-1:2018 and UL2231-2 Ed.2
K-No.:30626
Customer: Standard type Page 5 of 12
Absolute maximung ratings(6): Min. Typ. Max. Unit
VCEO Collector-Emitter voltage (PINs 6 and 7) 40 V
ICC,MAX Collector current (PINs 6 and 7) 50 mA
VCC Maximum supply voltage (without function) -0.3 6 V
UMax Maximum rated insulation voltage 250 V
VTEST-IN, low TEST-IN Input Voltage, low level 0 0.6 V
VTEST-IN, high TEST-IN Input Voltage, high level 2.5 5 V
(6)
Stresses above these ratings may cause permanent damage.
Exposure to these conditions for extended periods may degrade device reliability.
Functional operation of the device at these or any other conditions beyond those
specified is not supported. The values described here refer only to the basisinsulation

Final Tests: (Measurements after temperature balance of the samples at room temperature, SC=significant characteristic )
Min. Max. Unit
HV HV-test 1500 0 V
Vcc Supply voltage 4.9 5.1 VDC
Status & Calib Calib. Via UART
Icc Supply current 16 28 mA
RxD_Vcc RxD-T voltage 2.8 3.4 V
X6-OUT (normal) X6-OUT voltage 0 0.6 V
X20-OUT (normal) X20-OUT voltage 0 0.6 V
X6-OUT (activated) X6- -up) 4.9 5.1 V
X20-OUT (activated) X20-OUT voltage -up)* 4.9 5.1 V
TC1 (SC) Trip current_1 - X6-OUT +6mA DC / 80A@50Hz 4.5 5.4 mA
TC2 Trip current_2 - X6-OUT -6mA DC -5.4 -4.5 mA
TC3 Trip current_3 - X20-OUT 20mA@60Hz 14 20 mA
TC4 Trip current_4 X20-OUT 130mA@1000Hz 105 149 mA
LV1 Limit values of break time - X6-OUT@6mA DC 0 700 ms
LV2 Limit values of break time X20-OUT@20mA, 60Hz 0 1000 ms
EXT1 Externally winding test X6 act 4.9 5.1 V
EXT2 Externally winding test X20 act. 4.9 5.1 V

Product Tests:
Acc. to VAC sheet M3238 tbd
Air- and contact discharge; ±2.0 kV
ESD
Acc. to Human Body Model JESD22-A114

Requalification Tests: (replicated every year, Precondition acc. to M3238)

Impulse test (1.2µs/50µs waveform)
ÛW, prim-sec M3064 PIN 1-8 vs. primary wire 5.5 kV

Test voltage, 60s

Ud M3014 1.5 kV rms
PIN 1-8 vs. primary wire
Partial discharge voltage (extinction)
UPDE M3024 PIN 1-8 vs. primary wire 1.2 kV rms
*acc. to table 24 IEC 61800-5-1:2007
UPD x Partial discharge voltage (extinction)
M3024 PIN 1-8 vs. primary wire 1.5 kV rms
1.875
*acc. to table 24 IEC 61800-5-1:2007

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 Item no.: T60404-N4641-X836
Specification
VACU UM SCH M ELZE

Differential Current Sensor for EV-charging Date: 03.12.2024

acc. to the partly combined standards
IEC62955-1:2018 and UL2231-2 Ed.2
K-No.:30626
Customer: Standard type Page 6 of 12
Other instructions:
- Temperature of the primary conductor should not exceed 105°C.
- Housing and bobbin material UL-listed, flammability class 94V-0.
- Further standards UL 2231 E-file No. 488116, category FFUQ2 / FFUQ8
- The UART-interface is not suitable to use the alarm message for safety measure

Requirements to be fulfilled by the customer application

- Vcc during Test-IN function test must be at least 4.8V
- Fall- and rise-time of Vcc: t > 20µs/V
Figures:

I
I N1
or
I N2

I Rl1
or
I Rl2

Output t
condition
for
X6-OUT High
and Z
X30-OUT
X20-OUT
t

Fig. 2: Meaning of switching recovery level

If the trip-level I is reached the outputs X6-OUT and X20-OUT will change it state from
low-level (GND) to high impedance. Depending on the presence of the differential curent I , the
outputs X6-OUT and X20-OUT will remain in this state until I falls below recovery threshold I .

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 Item no.: T60404-N4641-X836
Specification
VACU UM SCH M ELZE

Differential Current Sensor for EV-charging Date: 03.12.2024

acc. to the partly combined standards
IEC62955-1:2018 and UL2231-2 Ed.2
K-No.:30626
Customer: Standard type Page 7 of 12

Vcc

40ms...1,2s

TEST_IN
Proposed t ime to
check M4: 2200ms

0,74s 0,66s t1 t2 t3

Internal test
current Itest1 Itest 2

440ms +/- 20ms

X6/30-OUT M1 M4
740ms
1400ms

1140ms +/- 20ms

X20-OUT M2 M4

1570ms +/- 30ms

ERR-OUT M3
M4

1800ms

200ms < tStart < 270ms

2030ms < t4 < 2100ms

t1 = 120ms Check for welded contacts.

t2 = 500ms Time for offset calibration.
t3 =10ms to 80ms Time required to store the offset calibration value. Depends
on the difference to the value already stored in memory.
M1...M4 points in time to check output levels
Fig. 3: Power-Up timing diagram

Fig. 5:UL2231 response value over frequency

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 Item no.: T60404-N4641-X836
Specification
VACU UM SCH M ELZE

Differential Current Sensor for EV-charging Date: 03.12.2024

acc. to the partly combined standards
IEC62955-1:2018 and UL2231-2 Ed.2
K-No.:30626
Customer: Standard type Page 8 of 12

X6-OUT X20-OUT State

GND GND Normal condition
High impedance GND I
GND High impedance I
I
High impedance High impedance or
Error, system fault
All other conditions not mentioned in the table are not possible. If these
conditions occur, the sensor is an unknown state and describes an Error.
Tab. 1: Possible output states

6mA 60mA 200mA

Standard values acc.
10s 0.3s 0.1s
to IEC62955:2018
Typical values of
0.45s 0.06s 0.035s
sensor
Tab. 2: Maximum and typical values of break time for residual direct currents

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 Item no.: T60404-N4641-X836
Specification
VACU UM SCH M ELZE

Differential Current Sensor for EV-charging Date: 03.12.2024

acc. to the partly combined standards
IEC62955-1:2018 and UL2231-2 Ed.2
K-No.:30626
Customer: Standard type Page 9 of 12
Typical application diagram using UART-interface:

Fig 6: UART Typical Application with Master

Figure 6 explains the typical application for the sensor with additional Master to interface the sensor. In this
system, the interface-signals TxD and RxD are cross connected (Master TxD -> Sensor RxD; Master RxD ->
Sensor TxD). The master addresses a sensor by sending a message acc. to the protocol described in chapter
Serial Data Interface (UART
The sensor monitors and trips via the switching outputs X6-OUT/X20-OUT if the leakage current exceeds the
response value.
A functional test can be started by the master using the test -message (see c Serial Data
Interface (UART)
The master has access to measured values via the -
message according to chapter Serial Data Interface (UART) .

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 Item no.: T60404-N4641-X836
Specification
VACU UM SCH M ELZE

Differential Current Sensor for EV-charging Date: 03.12.2024

acc. to the partly combined standards
IEC62955-1:2018 and UL2231-2 Ed.2
K-No.:30626
Customer: Standard type Page 10 of 12
Serial Data Interface (UART)

Specification Description
Address range 0xFF) Factory setting: 0x64 = 100d
1 startbit
8 data bits
Configuration 10 bit 1 stop bit
No parity
LSB first
Address
Message code Adress:0x01..0xFF, default address: 0X64
Message format Message length
Message data
Checksum: 2 Byte
LOW: Receive data
Data Direction (DE-PIN)
HIGH: transmit data
High-
TxD
Low-signal:
High-
Low-signal:
from the sensor pins to a master or interface
Transmission distance 200mm
driver
TxD Output-Resistance
TxD Short circuit behavior protected
Data transmitting rate 19200 baud
Cycle time T1 1/ 19200 (s)
Falling/rising time T2/T3 < 200ns
Tab. 3: Serial Data Interface (UART)

Data frame
T1 T2 T3
START

START

Data-
D1 D2 D3 D4 D5 D6 D7
STOP

Frame D0 D0

T4
Fig. 7: Data format UART-protocol
Timing
An idle time of more than 2 bytetimes between 2 bytes is interpreted as end of the message.
The slave starts to send an answer (begin of startbit) by no later than 20ms after reception of the stopbit of the last
message byte.
Between 2 requests to a slave, the master shall wait a minimum time of 50ms until the next request. This is to avoid
influence on the residual current measurement because of high traffic loads generated by a master.

Error handling
Each message transmitted has a 16-Bit checksum in the last two bytes transmitted to check the message integrity.
The crc is calculated byte by byte incorporating the complete message and then the two crc bytes are appended on
the end of the message.
The crc-polynom used is 0x18005 (x^16 + x^15 + x^2 + 1).
If a slave detects a crc-error, it does not answer that request. The master shall repeat the message up to 2 times and
if the slave still does not answer, the slave shall be considered to be defective.

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 Item no.: T60404-N4641-X836
Specification
VACU UM SCH M ELZE

Differential Current Sensor for EV-charging Date: 03.12.2024

acc. to the partly combined standards
IEC62955-1:2018 and UL2231-2 Ed.2
K-No.:30626
Customer: Standard type Page 11 of 12
General message format

Sensor- Message- Message- Message- CRC CRC

address Code Length Data[ ] high byte low byte
Tab. 4: General message format

The sensor address (1 byte) is the slave address in the range of 1..255. Address 0 is the broadcast address.
The message-code (1 byte) contains the coding instruction of the following bytes.
The message-length (1 byte) contains the length of the optionally following message-data field. 0 means no
message-data field follows.
The message-data-field contains the data for the message.
The crc (2 bytes) is calculated from sensor-address up to the last byte of the message-data field.
Numbers larger than 1 byte are transmitted most significant byte first.
Integer numbers are represented in two´s complement.

Messages Overview

Message Message-Code Description

Get measurement and status 0x01 Retrieve dc and rms value of the differential current.
Get info about operational state, fault state and hardware
coded configuration state
Start functional test 0x04 Start a functional test to determine correct switching ability
of the sensor hardware
Tab. 5: Message-Code

Start functional test

Master request Slave answer

Adr. address 1..255 Adr. Slave address
MsgCode 0x04 MsgCode 0x04
MsgLength 0x00 MsgLength 0x01
CRC crc highbyte MsgData[0] Infobyte
CRC crc lowbyte CRC crc highbyte
CRC crc lowbyte
Tab. 6: functional test

A functional test is started with this command.

Infobyte: 0x00 General problem, request cannot be executed.
0x01: Request accepted and will be executed
0x02: Request cannot be executed because a test or reset is
just active.
0x03..0xff: reserved
During the functional test an offset measurement is conducted. Offset measurement takes place during
the last max. 600ms before the end of the functional test sequence.

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 Item no.: T60404-N4641-X836
Specification
VACU UM SCH M ELZE

Differential Current Sensor for EV-charging Date: 03.12.2024

acc. to the partly combined standards
IEC62955-1:2018 and UL2231-2 Ed.2
K-No.:30626
Customer: Standard type Page 12 of 12
Get measurement and status

Master request Slave answer

Adr. address 1..255 Adr. Slave address
MsgCode 0x01 MsgCode 0x01
MsgLength 0x00 MsgLength 0x07
CRC crc highbyte MsgData[0..1] dIRMS, Highbyte in MsgData[0]
CRC crc lowbyte MsgData[2..3] dIDC, Highbyte in MsgData[2]
MsgData[4] Statusbyte 1 (Operational state)
MsgData[5] Statusbyte 2 (Fault state)
MsgData[6] Statusbyte 3 (Configuration state)
CRC crc highbyte
CRC crc lowbyte
Tab. 7: Master Slave communication

The measurement values of residual current rms and dc are represented in 0.1 mA resolution.
residual current.

Bit meaning
Bit 7 General fault 1 = fault
Bit 6 reserved
1 = functional test active
Bit 5 Testmode
0 = normal measurement
Bit 4 reserved
Bit 3 reserved
1=on, enabled, not tripped
Bit 2 state of X6
0=off, disabled, tripped
1=on, enabled, not tripped
Bit 1 state of X20
0=off, disabled, tripped
1 = no error, enabled
Bit 0 state of internal ERROR
0 = error, disabled
Tab. 8: Statusbyte 1

Bit meaning
Bit 7 reserved
Bit 6 reserved
Bit 5 Asic fault 1 = fault
Bit 4 Asic gain fault 1 = fault
Bit 3 Asic offset fault 1 = fault
Bit 2 Feedback fault 1 = fault
Bit 1 reserved
Bit 0 Configuration fault 1 = fault
Tab. 9: Statusbyte 2

Bit meaning
Bit 7 reserved
Bit 6 reserved
Bit 5 reserved
Bit 4 reserved
Bit 3 reserved
Bit 2 reserved
Bit 1 Unused always 0
Bit 0 reserved
Tab. 10: Statusbyte 3

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