SURGE PROTECTIVE DEVICE

Surge Protective Device

Specif ications
SPD (Surge Protective Device) is also known as TVSS (Transient Voltage Surge Suppressors.) Shihlin products
meet the IEC 61643-11, IEC 61312 standard of International Electrotechnical Commission, and follow the
standard IEC 61000-5-6, VDE 0675, NFC 61740, UL 1449-2, UL 1283, CSA 22.2, GB 18802-1, ANSI C62.41,
IEEE C62.41 and NFPA-70.

Electrical Characteristics
A. SPD structure: Inner core part is a metal oxide varistor made with zinc oxide.
B. Rated voltage (Un): The rated voltage of SPD device will be the same with rated voltage of the device
being protected.
C. Maximum continuous operating voltage (Uc): 155VAC, 275VAC (common), 385VAC, 440VAC (590VDC);
Uc should be 15% greater than Un.
D. Frequency: 48-60 Hz (also suited for DC.)
E. Time: 10~100ns.
F. Voltage protection level (Up): Less than rated impulse withstand voltage of the device being protected.
G. Life expectancy: It takes voltage surge 10000 times within rated discharge current (3kA.)
H. Impulse withstand voltage: 20kV (1.2/50µs)
I. Operating temperature: -5℃+40℃, relative humidity: 30~99%, operating altitude: 2000 meter below.
J. Provide parallel protection: L-N, L-G (L-E), N-G (N-E)
K. The test is done by applying 10 cycles of 1420 voltage and 300 ampere on to both side of the device.
Testing result is good that the device is not on fire.
(IEC requirement: SPD is allowed to caught on fire but cannot ignite surrounding object)

Features
A. Modular design, anti-error assembling design, withdraw able surge arrestor allow quick replacement of
the failed module (end of life) without cutting the power.
B. With standard DIN rail (35mm) installation, easy to install and speed up the replacing process.
C. The IP code dustproof and waterproof level is IP20.
D. Meets the IEC 61643-11 standard and CE declaration.
E. Voltage impulse counter (AC110V/220V) is available for monitoring maximum of 99 counts.
(Has memory function, non-return to zero after power failure.)

Operating Principle
A. Voltage limiting type SPD: Having high impedance when no surges occur and as the surge voltage and
current increase, the impedance decrease. By using varistor and transient voltage suppressor (TVS).
Leakage current is limited, with fast response time and low residual voltage.
B. Voltage switching type SPD: Having high impedance when no surges occur and become low impedance when
surges occur. Use discharge gap and gas discharge tube type parts. Voltage discharge capability is high.
C. Combination type SPD: A combination of voltage limiting type SPD and voltage switching type SPD. Having
fast response time characteristic of voltage limiting type SPD and strong discharge capability characteristic
of voltage switching type SPD.

Mechanical Auxiliary Contacts

Each device comes with auxiliary contacts for alarm device system to display malfunction.
BHP20、40 : 1NO、1NC
BHP80、100 : 1NO

BHP
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 SURGE PROTECTIVE DEVICE
Type Designation

BHP 20 3P R 320

Alarm auxiliary contact Max. continuous operating

Max. discharge
Number of R: with voltage Uc(V)
Type current
poles (P) Blank: without
Imax/Iimp (kA) Standard operation voltage

275V
20 20kA (8/20µs) R
1P: 1P 320V
1P1: 1P+1 275V
40 40kA (8/20µs) R
385V
2P: 2P
275V
BHP 80 80kA (8/20µs) 3P: 3P R
385V
3P1: 3P+1 275V
100 100kA (8/20µs) R
4P: 4P 385V
275V
250 25kA (10/350µs)
440V

In order to use surge protective devise more effectively, the following information is necessary.
1. The grounding system types of the protected device and the maximum operating voltage of the power grid Us. Max.
2. The impulse withstand voltage of the protected device.

Max. continuous operating

voltage Uc(V) TT TT IT IT
• Common mode
Protection of line to earth Protective
mode
TN-S TN-C Neutral
( Protection of line and Before After Neutral
point
neutral to earth) Grounding system point
RCD RCD earthing non-
earthing
• Differential mode
Protection of line to earth Common ─ ─ 2P 2P ─ 3P
and neutral(Protection of 275V
line to neutral and line to
320V
earth) Differential ─ ─ 1P+1 1P+1 1P+1 ─

Common 3P 4P 4P 4P ─ 3P
385V
440V
Differential 3P+1 ─ ─ ─ 3P+1 ─

Operating Conditions
‧Frequency: 48~60Hz.
‧Voltage: The voltage continuously applied on between the wiring terminal of the surge protective device shall not
exceed its maximum continuous operating voltage Uc.
‧Altitude: Less than 2,000M.
‧Temperature: - Normal range: -5℃ ~ +40℃;
- Ultimate range: -40℃ ~ +70℃;
‧ Humidity- Relative humidity: 30%~90%, non-condensing.

BHP
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SURGE PROTECTIVE DEVICE

Combination Selection of Surge Protective Device and Circuit Breaker

The internal core of SPD is one zinc-oxide pressure-sensitive element and zinc oxide consists of crystal. When a surge
current far beyond the upper-limit value flow through the SPD, certain crystal boundary in the ceramic will be damage.
Under extreme circumstances, excessive heat generated by continuous overloading will damage the crystal, and even
break the crystal down under serious conditions, leading to the fusion of Zno crystal and thus causing short circuit.
A ware of intense heat gives no time to transmit the heat to the thermal fuse, therefore, a fuse or circuit breaker must
be used for cutting off the power.
Even under the condition of precise parameter selection, the extreme temperature rise and burst of the SPD due to
overloading are not avoidable.

SPD Circuit Breaker

Max. discharge current Imax/Iimp (kA) Rated current Trip characteristic Model
20kA (8/20µs) 32A C BHA2XC32

40kA (8/20µs) 50A C BHA2XC50

80kA (8/20µs) 63A C BHA3XC63

100kA (8/20µs) 100A 10In± 20% BHA100XP100A

25kA (10/350µs) 100A 10In± 20% BHA100XP100A

Notes: 1. The X in the breaker model indicates the pole number, for example, to design a breaker for BHP40, in combination with 4-pole 25A breaker,
the model shall be BHA24C25.
2. The breaking capacity of the breaker must be larger than the maximum short circuit at the same position.
3. Protection shall be provided for each pole of the surge protective device.
4. For PT secondary circuit protection, due to the restriction of the maximum load current of PT, full consideration shall be given to the
following circumstance:
(1) The maximum short circuit current of PT, it is noted that, when discharge with excessive energy gets SPD breakdown and short- circuit,
the secondary circuit shall not have voltage break down. At this moment, the release current and quick response capacity of the breaker
must be considered.
(2) No-fuse circuit breaker may be considered, since standard no-fuse circuit breaker cannot be melted down by the pulse current. On the
contrary, the breaker can protect SPD from freewheeling, and damages caused by the continuous surge.

Parameter of Surge Protective Devices

Connection
Imax(kA) Iimp(kA)
Un Uc-AC Uc-DC Up In
Model (8/20µs) (10/350µs) Type
(V) (V) (V) (kV) (kA)
Class II Class I
L-N PE

275 350 1.1 10 20 -

BHP20 230/ 400 ≧2.5mm² ≧6mm²
320 410 1.2 10 20 -
Cassette
275 350 1.3 20 40 -
BHP40 230/ 400 ≧4mm² ≧16mm²
385 500 1.8 20 40 -
275 350 1.8 40 80 -
BHP80 230/ 400 ≧10mm² ≧25mm²
385 500 2.1 40 80 -
275 350 2.1 60 100 -
BHP100 230/ 400 Fixed ≧16mm² ≧25mm²
385 500 2.3 60 100 -
275 - 2.3 - - 25
BHP250 230/ 400 ≧25mm² ≧35mm²
440 - 2.3 - - 25

BHP
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 SURGE PROTECTIVE DEVICE
Wiring Diagrams
L
L L

PE
P1 P2
PE
1P 1P+1 2P (1P+N)

L1 L1 L1
L2 L2 L2
L3 L3 L3
N
N

Gap discharge
3P 3P+1 4P (3P+N)

Dimensions (mm)
BHP20/40 BHP80/100
3P1、4P 72 3P1、4P 72
3P 54 68.2 3P 68.5
54
1P1、2P 36 66.1 1P1、2P 66.1
36
1P 49.6 1P
18 49.6
18
90.6

90.6
45

45

BHP250
3P1、4P 142
3P 106.5
1P1、2P 66.7
1P 71
51.5
35.5 1.5
90.6

BHP
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SURGE PROTECTIVE DEVICE

Installation Method of SPD

1. The cable for connecting SPD shall be as short as possible, since
the impedance of the wire will weaken the protection capability
of SPD.
2. To ensure effective protection, it is suggested to install one lead-in
device to split the current at the incoming side of the device.
3. When a switching device and a SPD are mounted in a serial
manner, the wire shall be as short as possible.

The cassette module of BHP series surge protective device, there

is unique guiding hole at the bottom of the base; cassette module
with different specifications cannot be plugged in if interchanging
positions. The core side is using high-grade insulation material;
therefore, when pulling out the cassette module, its live parts
cannot be touched.
Short grounding cable Overlong grounding cable

4P 3P+1

Sensor Gap discharge

Sensor

Counter

Type TAD-04-99

Rated operation voltage AC 85~250V

Counter pulse threshold ≧ 1kA

Maximum count 99

Counting method Pulse

Counter display method 2 digits LED red

Minimum interval between counter pulses ≧ 200ms

Digital memory method Pulse falling edge, flash accumulation record

Dimension 91×68×18 (mm)

Note: Lightning strike pulse counter can count the discharge pulses and store them to the single-chip FLASH, and features intuitive display and small volume.

BHP
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 SURGE PROTECTIVE DEVICE
Selection Guide
1. The selection of SPD has nothing to do with transformer capacity or breaker's breaking capacity, it is based
on the device being protected and the installation location. Such as open place, downtown area, suburbs
area and thunder lighting frequency. BHP40 is recommended to be used in a normal application and increase
or decreases the rating depend on how the environment is. Select the numbers of poles depend on the number
of poles of the device being protected. There are chances that neutral pole will be damaged by lighting and
need protection as well. For example: power source with 3 phase 4 wires device, you should use 3P+N (4P)
or 3P+1 (3P1MOV+ GDT). This 3 phase compound modularize device has good insulating for protection,
which cassette module can be changed without cutting power.
2. When installing SPD in different positions, we recommend that the wire distance between 2 SPD should not
be less than 5m; otherwise, the added SPD doesn't provide additional protection. If the distance between
SPD and the protected equipment is greater than 30m, the surge will be amplified, which may cause the open
end of the equipment over-voltage. As the result, a SPD is recommended to be added, that is, the distance
between 2 SPD should be greater than 5m and less than 30m.
3. According to SPD testing requirements in UL 1449, a 100kA MCCB must be added in front of the SPD when
the SPD is wired in series with a 100kA power system. If the SPD is wired in parallel with the power system,
adding a MCCB is only for further protection. The purpose of MCCB is to disconnect the power when SPD is
short circuit caused by transient overvoltage. The rating of MCCB is depend on earthing method and the
distance between SPD and transformer, in which position the maximum short circuit current may occur.
The breaking capacity of MCCB is decided by transformer rating, it is not related to the kA value of the SPD.
4. SPD selection:
A. Make sure the surge was caused by lightning or operating overvoltage.
B. Verify the Lightning Protection Zones (LPZ0, LPZ1, LPZ2, and LPZ3).
C. Surge protecting mode is different depend on earthing method.
D. Verify the surge withstand capability of the protected device (Uimp) (kV).
E. Surge protection should be class II.
F. Add MCCB or HRC fuse for backup protection.
G. Keep the earthing wire as straight as possible because bending the wire will increase the earthing
impendence and affect the discharge of surge current.
H. Use standard wire to avoid skin effect.
I. The wire for earthing should be as short as possible (less than 0.5M) and wire diameter as big as possible.
J. Tie up the parallel earthing wire to separate with the other conductive parts.
5. Wiring method between continuation of power supply and equipment protection:
A. Ensure continuation of power supply: Add an overcurrent protection device in the SPD circuit to ensure
continuous power supply when the SPD is damaged. But when another surge occurs, both electrical
device and equipment will not get any protection.
B. Ensure equipment protection: if the overcurrent protection device is added right up-stream of the
protected SPD and equipment, the power will be cut off if SPD is damaged, but the equipment
protection is guaranteed.
C. Ensure continuous power supply and equipment protection: Using two SPD wiring in parallel to ensure
continuous power supply and protecting the equipment at the same time. When one SPD is damaged,
the other SPD will not be affected and continue protecting the equipment. (Picture 3)
6. There are 4 lightning protection levels (IEC 61312-1 standard): Type 1 protects electrical installations against
direct lightning strikes (protection level A) and is characterized by 10/350 µs current wave; type 2 prevents the
spread of over voltages in the electrical installations (protection level B, C, D) and is characterized by 8/20 µs
current wave.
7. The MOV surge protection devices' response time is between 10~100 ns or within 25ns. Device somewhere
in the market marked“response time within 1ns”should not be using MOV for protection.
8. The requirement and label marked value present difference; user must pay attention and clarify for selection.
For example: Peak Pulse Power Dissipation (Ppp) is usually between 150 watt to 90,000 watt, or presented in the
manner of Joules. This value is removed in UL 1449 standard due to the difficulty of the calculation of the value
and replaced with Short Circuit Current Rating (kA).
9. Lightning surge is discharge by earthing, as the result, the wiring for SPD is L-PE and N-PE. Transformer's neutral
line is connected with PR line, wiring method L-N, N-PE must be used in the way of combination. L-L method is
rarely used. BHP
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SURGE PROTECTIVE DEVICE

SPD Wiring Example

TN-C system three phase TN-S system three phase

Protection equipment

Protection equipment
SPD SPD

TN-C-S system three phase

ClassⅠprotection ClassⅡprotection

SPD SPD

Grounding connection Grounding connection

IT system three phase Single-Phase Power Supply Scheme

Protection equipment
Protection equipment

SPD

SPD

Special notes:
Time-delay leakage protector shall be selected for the RCD
in the power supply system; leakage protector insensitive
to atmospheric over-voltage shall be selected for the RCD
installed in residences and office buildings.

BHP
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 SURGE PROTECTIVE DEVICE
TT System Scheme 1 TT System Scheme 2

Protection equipment

Protection equipment
SPD SPD

Special notes:
Time-delay leakage protector shall be selected for the RCD in the power supply system; leakage protector insensitive to atmospheric over-
voltage shall be selected for the RCD installed in residences and office buildings.

TN-C TN-S IT
Residual current protection
Main panel Main panel Main panel

SPD SPD

Grounding connection

TT System Scheme 1 TT System Scheme 2

Residual current protection Residual current protection

Main panel Main panel

SPD
SPD
Grounding connection

Gap discharge

BHP
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MOTOR CONTROL (CONTACTOR/ MS/ MMS), CIRCUIT BREAKER (MCCB/ ELCB/ EMCCB/ MCB), AIR CIRCUIT BREAKER, AUTOMATIC
TRANSFER SWITCHES (Panel Board Type/ Residential Unit Use), SURGE PROTECTIVE DEVICE, LOW VOLTAGE POWER CAPACITORS,
SMART METER, INVERTER

 
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