Accessories

Contactor Accessories

We use the terms DC and AC contactors to describe the type of power in the circuit being switched.

Accessories for DC or AC contactors may have different designs. For example, your choice of voltage surge and arc suppression devices may change depending on whether your have DC or AC power.


Auxiliary Contact Blocks

Refers to the housing for auxiliary contacts. View our full selection of auxiliary contact blocks for our DC and AC contactor lines below.

Auxiliary Contact Blocks for DC and AC contactor

For CWC Series Miniature Contactors

For Use With Max number of
contacts/mini
contactor
Auxiliary Contacts For Use with CWC0
(3 pole)
For Use with CWC0
(4 pole)
For Use with CWCA0
N.O. N.C. Terminal
Markings
Model No. Terminal
Markings
Model No. Terminal
Markings
Model No.
CWC07...16
CWCA0
2 2 0 Auxiliary Contact Block Terminal Markings BFC0-20 Auxiliary Contact Block Terminal Markings BFC4-20 Auxiliary Contact Block Terminal Markings BFCA-20
1 1 Auxiliary Contact Block Terminal Markings BFC0-11 Auxiliary Contact Block Terminal Markings BFC4-11 Auxiliary Contact Block Terminal Markings BFCA-11
0 2 Auxiliary Contact Block Terminal Markings BFC0-02 Auxiliary Contact Block Terminal Markings BFC4-02 Auxiliary Contact Block Terminal Markings BFCA-02
4 4 0 Auxiliary Contact Block Terminal Markings BFC0-40 Auxiliary Contact Block Terminal Markings BFC4-40 Auxiliary Contact Block Terminal Markings BFCA-40
2 2 Auxiliary Contact Block Terminal Markings BFC0-22 Auxiliary Contact Block Terminal Markings BFC4-22 Auxiliary Contact Block Terminal Markings BFCA-22
0 4 Auxiliary Contact Block Terminal Markings BFC0-04 Auxiliary Contact Block Terminal Markings BFC4-04 Auxiliary Contact Block Terminal Markings BFCA-04
3 1 Auxiliary Contact Block Terminal Markings BFC0-31 Auxiliary Contact Block Terminal Markings BFC4-31 Auxiliary Contact Block Terminal Markings BFCA-31
1 3 Auxiliary Contact Block Terminal Markings BFC0-13 Auxiliary Contact Block Terminal Markings BFC4-13 Auxiliary Contact Block Terminal Markings BFCA-13
CWC025 2 2 0 Auxiliary Contact Block Terminal Markings BFC025-20 - - - -
1 1 Auxiliary Contact Block Terminal Markings BFC025-11 - - - -
0 2 Auxiliary Contact Block Terminal Markings BFC025-02 - - - -

Low consumption 24V VDC contactors can only use 2 pole auxiliary contact blocks.

For CWM Series Contactors

For Use With Auxiliary Contacts Model No. Location/Description Dimensional Diagram Data Sheet
N.O. N.C.
CWM09...105 1 0 BCXMF10 Front Mounting PDF
DWG
Data Sheet
0 1 BCXMF01 Front Mounting
CWM09...CWM300 1 1 BCXML11 Side Mounting PDF
DWG
2 0 BCXML20 Side Mounting
1 1 BCXMRL11 Side Mounting, Second Block
2 0 BCXMRL20 Side Mounting, Second Block
CWME400...CWME800 1 1 BCXML11 CWM800 Side Mounting PDF
DWG
1 1 BCXMRL11 CWM800 Side Mounting, Second Block

Maximum number of added auxiliary contacts per contactor frame size (Note that side mountable versions have 2 aux. contacts per block):

• CWM9...25 - 4 aux. contacts
• CWM32...40 - 6 aux. contacts
• CWM50...300E - 8 aux. contacts

For CWB Series Contactors

For Use With Auxiliary Contacts Model No. Location/Description
N.O. N.C.
CWB9..38     BFB-11 Front Mounting
    BFB-20
    BFB-02
    BFB-22
    BFB-22 EL
    BFB-40
    BFB-04
    BFB-31
    BFB-13
    BLB11 Side Mounting
    BLB20
    BLB02
    BLB02
    BLRB20
    BLRB02

Mechanical Interlocks

Interlocks connect input signals and switch contacts in some way so as to prevent undesired or potentially dangerous conditions. Generally, this means preventing two (or more) sets of contacts from closing at the same time.

Mechanical interlocks are typically used for forward-reverse applications where you have two contactors wired to a motor in such a way so that when one contactor closes the motor rotates in one direction, and when the other contactor closes the motor rotates in the reverse direction.

View our selection of mechanical interlock blocks for our DC and AC contactor lines below.

Mechanical Interlock Blocks for DC and AC contactor
For Use With Auxiliary Contacts Location/Description Model No. Dimensional Diagram Data Sheet
N.O. N.C.
CWC07...25
CWCA0
0 0 Front mounted BIC0 PDF
DWG
CWC Series
RMC0 PDF
DWG
CWC Series
CWM09...105 0 0 Side mounted between two contactors BLIM 9-105 PDF
DWG
CWM Series
CWM112...CWM300 0 2 BLIM.02 9-105 PDF
DWG
CWM400 0 0 BLIM 112-300 PDF
DWG
CWM400...CWM800 0 0 BLIM CWME400 PDF
DWG
0 0 Bottom mounted BLIM CWME800 PDF
DWG
CWB9...38 0 0 Between 2 contactors, no additional side space IM1 PDF
DWG
CWB Series

For CWM9...105, the mechanical interlock can be used to interlock different frame sizes. From CWM112...300, the mechanical interlock must be used with contactors with the same mechanical frame size.

For BLIM CWME800, a metal mount base is provided for an accurate assembling of the contactors.


Replacement Coils

Contactor coils are the most prone to damage and failure, so replacement coils are frequently required. View our selection of DC and AC contactor coils below.

Surge suppressor for dc or ac contactor

AC Coils

For Use With Coil Voltage
24V 48V 120V 208-240V 277V 480V 600V
CWM9...25 BCA4-25V04 BCA4-25V10 BCA4-25V18 BCA4-25V24 BCA4-25V37 BCA4-25V47 BCA4-25V56
CWM32...40 BCA4-40V04 BCA4-40V10 BCA4-40V18 BCA4-40V24 BCA4-40V37 BCA4-40V47 BCA4-40V56
CWM50...105 BCA-105V04 BCA-105V10 BCA-105V18 BCA-105V24 BCA-105V37 BCA-105V47 BCA-105V56

DC Coils

For Use With Coil Voltages
24-28V 110-130V
CWM0...25 BCC-25C034 BCC-25C040
CWM32...40 BECC4-40C34 BECC4-40C40
CWM50...105 BECC-105C34 BECC-105C40

AC/DC Coils

For Use With Coil Voltages
24 Vac/Vdc 110-130 Vac/Vdc 208-250 Vac/Vdc 430-500 Vac/Vdc
CWM112...150 BCE-150E02 BCE-150E10 BCE-150E13 BCE-150E21
CWM112...300 ME-300E02 ME-300E10 ME-300E13 ME-300E21
CWM180 BCE-215E02 BCE-215E10 BCE-215E13 BCE-215E21
CWM250...300 BCE-300E02 BCE-300E10 BCE-300E13 BCE-300E21
For Use With Coil Voltages
100-240 Vac 100-127 Vac 200-240 Vac 440-575 Vac
100-220 Vdc 100-110 Vdc 200-220 Vdc
CWM400 BCE-400E36 BCE-400E35 BCE-400E39 BCE-400E82
CWM630...CWM800 BCE-800E36 BCE-800E35 BCE-800E39 BCE-800E82
For Use With Coil Voltages (VAC) Model No.
CWB9...38 24 BBR-38D02
48 BBR-38D07
110 BBR-38D13
120 BBR-38D15
127 BBR-38D17
208 BBR-38D77
220 BBR-38D23
230 BBR-38D24
240 BBR-38D25
380 BBR-38D33
400 BBR-38D34
415 BBR-38D35
440 BBR-38D36
480 BBR-38D39
600 BBR-38D45

Surge Suppressors

Surge suppressors are devices that protect electrical circuits from sudden voltage spikes and are especially needed in circuits that have inductors. The voltage surge that occurs when a coil is de-energized is known as inductive kickback.

When the control circuit is opened, according to Faraday's Law, the decreasing magnetic field around the contactor coil when the will create an induced emf (electromotive force), measured in volts. Since Faraday's Law is a function of the rate of change of a magnetic field over time, there will be a massive induced emf voltage because the magnetic field around the inductor coil collapses almost instantaneously. Though this voltage surge only lasts for a split-second, it has the potential to ruin electrical contacts.

In some cases, poor or misapplied surge suppressors can even cause armatures to momentarily reverse direction, which can cause weak ("tack") welds to form that shorten the service life of the contacts.

Surge suppressors help dissipate the energy from a collapsing magnetic field around an inductor, essentially slowing down the rate at which the field collapses. However, this affects coil drop-out time.

Drop-out time

Coil drop-out time refers to the length of time between the opening of the control circuit, which de-energizes the coil, to the opening of the contacts. You can determine how good a surge suppressor is by checking how it affects the drop-out time for a given contactor.

A longer drop-out time means contacts take longer completely separate, which means arcs also take longer to extinguish. Good surge suppressors will not increase the drop-out time by much.

AC/DC Coil Electronic Module contactors already have built-in surge suppressors.

Surge suppressor for dc or ac contactor
For Use With Circuit Diagram Voltage Model No. Dimensional Diagram Data Sheet
CWC07...25
CWCA0
Surge Suppressor Circuit Diagram CWC07...25 CWCA0 24-48V 50/60 Hz RCC0-2 D53 PDF
DWG
CWC Series
50-127V 50/60 Hz RCC0-3 D55
130-250V 50/60 Hz RCC0-4 D63
400-510V 50/60 Hz RCC0-6 D73
Surge Suppressor Circuit Diagram CWC07...25 CWCA0 12-48V 50/60 Hz / 12-60 VDC VRC0-1 E49
50-127V 50/60 Hz / 60-180 VDC VRC0-2 E34
130-250V 50/60 Hz / 180-300 VDC VRC0-3 E50
400-510V 50/60 Hz VRC0-5 D73
CWC07...16
CWCA0
Surge Suppressor Circuit Diagram CWC07...16 CWCA0 12-600 VDC DIC0-1 C33
CWM9...40 - 4 - 48 VAC BAMRC4 D53 PDF
DWG
CWM Series
50 - 27 VAC BAMRC5 D55
130 - 250 VAC BAMRC6 D63
CWM50...105 - 24 - 48 VAC BAMRC7 D53
50 - 127 VAC BAMRC8 D55
130 - 250 VAC BAMRC9 D63
CWM9...105 - 270 - 380 VAC BAMV D68
400 - 510 VAC BAMV D73
CWB9...38   24-48V 50/60 Hz RCB-D53 PDF
DWG
CWB Series
50-127V 50/60 Hz RCB-D55
130-250V 50/60 Hz RCB-D63
12-48V 50/60 Hz / 12-60 VDC VRB-E49
50-127V 50/60 Hz / 60-180 VDC VRB-E34
130-250V 50/60 Hz / 180-300 VDC VRB-E50
277-380V 50/60 Hz / 300-510 VDC VRB-E41
400-510V 50/60 Hz VRB-D73
12-600 VDC DIB-C33
12-250 VDC DIZB-C26