Contactors, Overloads

AND DOL Starters

Easy Selection Guide

MOTOR CONTROL

nhp.com.au

step

Follow the 3 Easy Steps to select the right contactor for your application.

STEP 1: Select Your Current Rating

Contactors are most commonly used in motor applications. Motor ratings are referred to as
AC3 Motor Amps or Motor Full Load Current (page 6).
What is the Motor Full Load Current?
This rating can be obtained from the nameplate of the motor or from the motor manufacturer.
When selecting a CA 7 contactor for the motor, be sure to refer to the column labelled as
AC3 Motor Amps.
There may be occasions where only the motor size (in kW) is supplied.
Please use the table below to estimate the AC3 Motor Amps rating.

Typical ratings for 3-phase motor

or
2

Motor size (kW)

0.06
0.09
0.12
0.18
0.25
0.37
0.55
0.75
1.1
1.5
2.2
3.7
4
5.5
7.5
11
15
18.5
22
30
37
45
55

Approx. full load current @ 415 V (AC 3 amps)

0.3
0.4
0.5
0.6
0.8
1.1
1.5
1.8
2.6
3.4
4.8
7.6
8.2
11
14
21
28
34
40
55
66
80
95

While contactors are most commonly used in motor applications, they can also be used with
resistive loads such as a water heater. The ratings of these loads are referred to as nominal current.
These ratings are supplied by the manufacturer of the load. When selecting a CA 7 contactor
for resistive loads, be sure to refer to the column labelled AC 1 amps (page 6).

step

STEP 2: Select Your Coil Voltage

CA 7 contactors are most commonly supplied with a 240 V AC rated coil. However, they can be
ordered complete with other coil voltages.
Coils are easily interchangeable for alternative coil voltages.
Select from 24, 110 and 415 V AC coils from the table labelled Spare Coils (page 7), and then follow
the three easy steps to change from a standard 240 V AC coil to the alternative chosen.

Change your coil in three easy steps:

1
3

1. 
Place two flat-head screw drivers in position 1 & 2.

Unclip top half by pulling the clips back (away from the contactor).

2. 
Top half will spring off.

Pull old coil out, and place spare in position 3.

Ensure spring is in place to mount top half above the new coil 4.

3. Place the two screw drivers in positions 5 & 6.

Push clips back into their original position.

Top half is now securely mounted and contactor is ready for use.

step

STEP 3: Select Auxiliary Contacts (Optional)

As an additional option, CA 7 contactors have auxiliary contacts.
CA 7-9 to CA 7-23 have either 1 x N/O or 1 x N/C auxiliary contact in-built.
CA 7-30 to CA 7-97 do not have in-built auxiliary contacts, therefore may require auxiliary
contact blocks to be externally mounted.
These can be mounted on the top or side of the CA 7 contactors.
When selecting an auxiliary contact block, please refer to the
Auxiliary Contacts Blocks Table (page 6). These can be supplied separately.

CA 7 clip-on accessory modules

examples

An Electrical fitter requires an AC contactor for a motor with full load current of
11 amps, a 230 V AC rated coil and 1 x N/C contact.
AC 3

AC 3

AC 1

Motor amps

Motor size (kW)

Amps

N/O

N/C

32

CA7-9-01-240V-AC

12

5.5

CA7-12-10-240V-AC

CA7-12-01-240V-AC

16

7.5

32

CA7-16-10-240V-AC

CA7-16-01-240V-AC

23

11

32

CA7-23-10-240V-AC

30

15

65

Select
contactor
rated up to
12 amps

Auxiliary contacts

230 V AC coil
standard with
CA 7 contactors

CA7-9-10-240V-AC

CA7-23-01-240V-AC

CA7-30-00-240V-AC
CA7-37-00-240V-AC

37

18.5

65

43

22

85

CA7-43-00-240V-AC

60

32

100

CA7-60-00-240V-AC

72

40

100

CA7-72-00-240V-AC

85

45

100

CA7-85-00-240V-AC

97

55

130

CA7-97-00-240V-AC

Select contactor
with 1 x N/C
auxiliary contact

The fitter also requires an AC contactor for a motor with Full Load Current of 40 amps,
a 24 V AC rated coil and 2 x N/O contacts.
AC 3

AC 3

AC 1

Motor amps

Motor size (kW)

Amps

N/O

N/C

32

CA7-9-01-240V-AC

CA7-12-10-240V-AC

Select
contactor
rated up to
43 amps

Auxiliary contacts

110 V AC

240 V AC

415 V AC

CA7-9-10-240V-AC

5.5

CA7-12-01-240V-AC

16

7.5

32

CA7-16-10-240V-AC

CA7-16-01-240V-AC

23

11

32

CA7-23-10-240V-AC

CA7-23-01-240V-AC

30

15

65

CA7-30-00-240V-AC

37

18.5

65

CA7-37-00-240V-AC

43

22

85

CA7-43-00-240V-AC

60

32

100

CA7-60-00-240V-AC

72

40

100

CA7-72-00-240V-AC

85

45

100

CA7-85-00-240V-AC

97

55

130

CA7-97-00-240V-AC

Coils with alternative

voltages for AC contactors
24 V AC

Cat. No.1)

12

Since no aux contacts with CA 7-43,

select the following aux contact block

Take 230 V AC coil out and select the following

Fit new
coil in contactor

Cat. No.1)

To suit

Cat. No.

No. of poles

CA7-9 to CA-16
CA7-23 to CA7-37
CA7-43
CA7-60 to CA7-85
CA7-97
CA7-9 to CA-16
CA7-23 to CA7-37
CA7-43
CA7-60 to CA7-85
CA7-97
CA7-9 to CA-16
CA7-23 to CA7-37
CA7-43
CA7-60 to CA7-85
CA7-97
CA7-9 to CA-16
CA7-23 to CA7-37
CA7-43
CA7-60 to CA7-85
CA7-97

CAC7-16-24V-AC
CAC7-37-24V-AC
CAC7-43-24V-AC
CAC7-85-24V-AC
CAC7-97-24V-AC
CAC7-16-110V-AC
CAC7-37-110V-AC
CAC7-43-110V-AC
CAC7-85-110V-AC
CAC7-97-110V-AC
CAC7-16-240V-AC
CAC7-37-240V-AC
CAC7-43-240V-AC
CAC7-85-240V-AC
CAC7-97-240V-AC
CAC7-16-415V-AC
CAC7-37-415V-AC
CAC7-43-415V-AC
CAC7--85415V-AC
CAC7-97-415V-AC

1
1
2
2

Auxiliary contacts
N/O
N/C
0
1
1
0
1
1
2
0

Cat. No.
CA7-PA-01
CA7-PA-10
CS7-PA-11
CA7-PA-20

Supply aux
contact block with
CA 7 contactor

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Part

CA 7 Contactors 4-55 kW with AC Coil

AC 3

Motor amps

Motor size
(kW)

Amps

N/O

N/C

32

AC 1

CA 7-9-01-240V-AC

CA 7-12-10-240V-AC

CA 7-12-01-240V-AC

CA 7-16-10-240V-AC

CA 7-16-01-240V-AC

CA 7-23-10-240V-AC

CA 7-23-01-240V-AC

12

5.5

32

16

7.5

32

23

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Auxiliary
contacts

AC 3

11

32

Cat. No. 1)
CA 7-9-10-240V-AC

30

15

65

CA 7-30-00-240V-AC

37

18.5

65

CA 7-37-00-240V-AC

43

22

85

CA 7-43-00-240V-AC

60

32

100

CA 7-60-00-240V-AC

72

40

100

CA 7-72-00-240V-AC

85

45

100

CA 7-85-00-240V-AC

97

55

130

CA 7-97-00-240V-AC

) Contactors can be ordered complete with alternative coils.

Replace 240 with 24, 32, 110 & 415.

Auxiliary Contact Blocks (Top Mounting) 2)

No. of poles

Auxiliary contacts
N/O

N/C

Suit CA 7 3)

Cat. No.

CA 7-9 to CA 7-23

CA 7-PV-S11

CA 7-30 to CA 7-97

CA 7-PV-11

All

CS 7-PV-11

CA 7-9 to CA 7-23

CA 7-PV-S22

CA 7-30 to CA 7-97

CA 7-PV-22

All

CS 7-PV-40

One top-mount auxiliary per contactor only.

Recommendation only. All auxiliary contacts will fit any CA 7 contactor.

2)
3)

Auxiliary Contact Blocks (Side Mounting) 4)

No. of poles

4)

Auxiliary contacts

Cat. No.

N/O

N/C

CA 7-PA-01

CA 7-PA-10

CS 7-PA-11

CA 7-PA-20

Two side-mount auxiliaries per contactor only (one on each side).

Side & top auxiliary contact blocks can be utilised together.

Spare Coils
Coil voltages

24 V AC

110 V AC

240 V AC

415 V AC

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To suit

Cat. No.

CA 7-9 to CA-16

CA C7-16-24V-AC

CA 7-23 to CA 7-37

CA C7-37-24V-AC

CA 7-43

CA C7-43-24V-AC

CA 7-60 to CA 7-85

CA C7-85-24V-AC

CA7-97

CAC7-97-24V-AC

CA 7-9 to CA -16

CA C7-16-110V-AC

CA 7-23 to CA 7-37

CA C7-37-110V-AC

CA 7-43

CA C7-43-110V-AC

CA 7-60 to CA 7-85

CA C7-85-110V-AC

CA7-97

CAC7-97-110V-AC

CA 7-9 to CA -16

CA C7-16-240V-AC

CA 7-23 to CA 7-37

CA C7-37-240V-AC

CA 7-43

CA C7-43-240V-AC

CA 7-60 to CA 7-85

CA C7-85-240V-AC

CA7-97

CAC7-97-240V-AC

CA 7-9 to CA-16

CA C7-16-415V-AC

CA 7-23 to CA 7-37

CA C7-37-415V-AC

CA 7-43

CA C7-43-415V-AC

CA 7-60 to CA 7-85

CA C7-85-415V-AC

CA7-97

CAC7-97-415V-AC

CA 7 Contactors Accessories & Spares

Function

Description

pneumatic on-delay timer

time range
0.3 - 30 seconds
1.8 - 180 seconds
Time range
0.3 - 30 seconds
1.8 - 180 seconds

pneumatic off-delay timer

Cat. No.
CZ E-7-30
CZ E-7-180
CZA-7-30
CZA-7-180

mechanical interlock

interlock only
Interlock with 2 x N/C

CM7
CM7-02

electronic PLC interface 1)

Digital input
18 - 30 V DC (10 - 15mA)

CRI-7E

) Suitable for control voltages between 110 and 240 V AC.

Bi-Metal Thermal Overloads

To choose your Bi-Metal Thermal Overload, check the motor name plate for the full load current
and match it to the Motor Current Range (A). Also ensure the overload selected suits the
CA 7 contactor.
Approx.
motor size (kW)

Motor current
range (A)

To suit contactor

Cat. No.

0.1 to 0.16

CA 7-9 to CA 7-23

CT 7N-23-A16

0.16 to 0.25

CA 7-9 to CA 7-23

CT 7N-23-A25

0.06 or 0.09

0.25 to 0.40

CA 7-9 to CA 7-23

CT 7N-23-A40

0.09 or 0.12

0.35 to 0.50

CA 7-9 to CA 7-23

CT 7N-23-A50

0.18

0.45 to 0.63

CA 7-9 to CA 7-23

CT 7N-23-A63

0.18 or 0.25

0.55 to 0.80

CA 7-9 to CA 7-23

CT 7N-23-A80

0.25

0.75 to 1.0

CA 7-9 to CA 7-23

CT 7N-23-B10

0.37

0.9 to 1.3

CA 7-9 to CA 7-23

CT 7N-23-B13

0.55

1.1 to 1.6

CA 7-9 to CA 7-23

CT 7N-23-B16

CT 7N

0.55 or 0.75

1.4 to 2.0

CA 7-9 to CA 7-23

CT 7N-23-B20

Bi-Metal thermal overload for

standard motors up to 95 kW

0.72 or 1.1

1.8 to 2.5

CA 7-9 to CA 7-23

CT 7N-23-B25

1.1

2.3 to 3.2

CA 7-9 to CA 7-23

CT 7N-23-B32

Manual reset

1.5

2.9 to 4.0

CA 7-9 to CA 7-23

CT 7N-23-B40

Standard trip class 10

overload curve

2.2

3.5 to 4.8

CA 7-9 to CA 7-23

CT 7N-23-B48

2.2

4.5 to 6.3

CA 7-9 to CA 7-23

CT 7N-23-B63

5.5 to 7.5

CA 7-9 to CA 7-23

CT 7N-23-B75

3.7

7.2 to 10

CA 7-9 to CA 7-23

CT 7N-23-C10

5.5

9 to 12.5

CA 7-12 to CA 7-23

CT 7N-23-C12

5.5

Suitable for single phase and

3-phase applications.

11.3 to 16

CA 7-16 to CA 7-23

CT 7N-23-C16

7.5

15 to 20

CA 7-16 to CA 7-23

CT 7N-23-C20

17.5 to 21.5

CA 7-16 to CA 7-23

CT 7N-23-C21

11

21 to 25

CA 7-16 to CA 7-23

CT 7N-23-C25

7.5

15 to 20

CA 7-30 to CA 7-37

CT 7N-37-C20

11

17.5 to 21.5

CA 7-30 to CA 7-37

CT 7N-37-C21

11

21 to 25

CA 7-30 to CA 7-37

CT 7N-37-C25

15

24.5 to 30

CA 7-30 to CA 7-37

CT 7N-37-C30

18.5

29 to 36

CA 7-30 to CA 7-37

CT 7N-37-C36

18.5

33 to 38

CA 7-30 to CA 7-37

CT 7N-37-C38

11

17 to 25

CA 7-43

CT 7N-43-C25

15 or 18.5

24.5 to 36

CA 7-43

CT 7N-43-C36

18.5 or 22

35 to 47

CA 7-43

CT 7N-43-C47

18.5 or 22

35 to 47

CA 7-60 to CA 7 -97

CT 7N-85-C47

30

45 to 60

CA 7-60 to CA 7 -97

CT 7N-85-C60

37

58 to 75

CA 7-60 to CA 7 -97

CT 7N-85-C75

45

72 to 90

CA 7-60 to CA 7 -97

CT 7N-85-C90

Electronic Overloads for 3-Phase motors

CEP 7-ED
Standard overload for motors up to 15 kW
Also suits CAT 7N DOL starters
Reduced power consumption and heat
output

Manual reset button

Reduces stock levels due to wide current range
Trip class 10 overload curve for standard motors.

Approx. motor kW range

Motor current
range (A)

0.02 to 0.12

0.1 to 0.5

CA 7-9 to CA 7-23

0.06 to 0.25

0.2 to 1

CA 7-9 to CA 7-23

CEP7-ED1BB

0.25 to 2.2

1 to 5

CA 7-9 to CA 7-23

CEP7-ED1CB

1.5 to 7.5

3.2 to 16

CA 7-9 to CA 7-23

CEP7-ED1DB

2.2 to 15

5.4 to 27

CA 7-9 to CA 7-23

CEP7-ED1EB

4 to 22

9.0 to 45

CA 7-30 to CA 7-43

CEP7-ED1FD

To suit contactor

Cat. No.
CEP7-ED1AB

Electronic Overloads for 3-Phase Motors

CEP 7-EE
Enhanced overload for motors up to 45 kW
Accepts side mount modules
Reduced power consumption and heat
output

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1)

Ideal for motors with longer run up times

Automatic & manual reset button
Adjustable trip classes - 10, 15, 20, 30
(dip switches).

Approx. motor
kW range 1)

Motor current
range (A)

To suit contactor

Cat. No.

0.02 to 0.12

0.1 to 0.5

CA 7-9 to CA 7-23

CEP7-EEAB

0.06 to 0.25

0.2 to 1

CA 7-9 to CA 7-23

CEP7-EEBB

0.25 to 2.2

1 to 5

CA 7-9 to CA 7-23

CEP7-EECB

1.5 to 7.5

3.2 to 16

CA 7-9 to CA 7-23

CEP7-EEDB

2.2 to 15

5.4 to 27

CA 7-9 to CA 7-23

CEP7-EEEB

2.2 to 15

5.4 to 27

CA 7-30 to CA 7-43

CEP7-EEED

4 to 22

9 to 45

CA 7-30 to CA 7-43

CEP7-EEFD

11 to 45

18 to 90

CA 7-60 to CA 7-97

CEP7-EEGE

22 to 55

60 to 120

CA 7-30 to CA 7-97

CEP7-EEVE

Refer to NHP Part A for higher kW ratings.

Overload Accessories
CT7N
Front Mount
Accessory

CEP7-ERR
Side Mount
Accessory

Function

Description

To suit overload

Cat. No.

Remote reset module

For remote reset after an

overload trip

CT 7N Range

CMR7N240VAC 1)

Remote reset module

For remote reset after an

overload trip

CEP 7-EE Range

CEP7-ERR

1)

Change control voltage to Cat. no., when ordering 24, 110 AC or 24, 48 DC.

1. Select Enclosure Type with CA 7 Contactor

To choose your bi-metal thermal overload, check the motor name plate for the full load current
and match it to the motor current range (A). Also ensure the overload selected suits the
CA 7 contactor.
Approx. motor
Contactor type
DOL setting range
kW range
Insulated enclosure with green start and red stop button
5.5
CA 7-12
0.1 to 16
7.5
CA 7-16
3.2 to 17.5
Insulated enclosure with blue reset button only
5.5
CA 7-12
0.1 to 16
7.5
CA 7-16
3.2 to 17.5
Insulated enclosure with green start and red mushroom stop button
5.5
CA 7-12
0.1 to 16

Cat. No. 1)
CAT7N-5.5P-240-V-AC
CAT7N-7.5P-240V-AC
CAT7N-5.5R-240-V-AC
CAT7N-7.5R-240V-AC
CAT7N-5.5PM-240-V-AC

) For 3-phase voltage, add 415 in place of 240.

or

2A. Select Electronic Overload to Suit

For more flexibility (large kW ranges) select electronic overload.
Approx. motor kW range
0.02 to 0.12
0.06 to 0.25
0.25 to 2.2
1.5 to 7.5
2.2 to 15

Motor current range (A)

0.1 to 0.5
0.2 to 1
1 to 5
3.2 to 16
5.4 to 27

Cat. No.
CEP7-ED1AB
CEP7-ED1BB
CEP7-ED1CB
CEP7-ED1DB
CEP7-ED1EB

2B. Select Thermal Bi-Metal Overload

For typical motor applications with standard motor size select Thermal Bi-Metal Overload.

10

Approx. motor kW range

Motor current range (A)

Cat. No.

0.13 to 0.18
0.15 to 0.25
0.23 to 0.34

0.1 to 0.16
0.16 to 0.25
0.25 to 0.40
0.35 to 0.50
0.45 to 0.63
0.55 to 0.80
0.75 to 1.0

CT7N-23-A16
CT7N-23-A25
CT7N-23-A40
CT7N-23-A50
CT7N-23-A63
CT7N-23-A80
CT7N-23-B10

0.3 to 0.48

0.9 to 1.3

CT7N-23-B13

0.38 to 0.65
0.52 to 0.8
0.72 to 1.1
1 to 1.4
1.3 to 1.7
1.6 to 2.2
2 to 2.8
2.5 to 3.5
3.3 to 5
4.3 to 6
5.2 to 8

1.1 to 1.6
1.4 to 2.0
1.8 to 2.5
2.3 to 3.2
2.9 to 4.0
3.5 to 4.8
4.5 to 6.3
5.5 to 7.5
7.2 to 10
9 to 12.5
11.3 to 16

CT7N-23-B16
CT7N-23-B20
CT7N-23-B25
CT7N-23-B32
CT7N-23-B40
CT7N-23-B48
CT7N-23-B63
CT7N-23-B75
CT7N-23-C10
CT7N-23-C12
CT7N-23-C16

EASY SELECTION GUIDE:

Sprecher + Schuh Contactor Ratings Chart & iPhone App

NHP have developed a brochure and a ratings chart to ensure
your industrial control needs are met promptly and effortlessly.
Ratings Chart includes:
Clear pictures of entire
Sprecher + Schuh contactor range
Easy look-up table for overloads
matching corresponding contactor
chosen
Complete ratings (current & motor
starter ratings, capacitor switching and
mechanical, electrical and coil data)
Keep the chart handy to make your
selection process quick and easy.

CONTACTOR SELECT
IPHONE APP
If you liked the Sprecher Wheel,
make sure you download
the NHP iPhone App called
Contactor Select which is the
digital version with added
bonuses such as one click
service support.

Now available
on the iTunes App
Store now or at
nhp.com.au

11

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Tel 0800 NHP NHP
Wellington
52 Victoria Street
Lower Hutt 5010
Tel +64 4 570 0634
Christchurch
85 Gasson Street
Sydenham 8023
Tel +64 3 377 4407