Relays

Relays are electrical control components used to switch connected loads, monitor current, and provide control outputs in commercial electrical installations. This category includes enclosed and track-mount relay assemblies for control panels, fan-control circuits, supervised systems, distributed control points, and AC current-monitoring applications.

Product Display:
Helpful Buying Guide

Choose a relay for the control function you need

Start with the required function: switching a load, retaining a contact state, supporting a supervised circuit, controlling a fan, or sensing AC current. Then compare control voltage, contact arrangement, electrical rating, enclosure or mounting format, and any integrated features such as LED indication, override capability, current sensing, or transmitter output.

Visual Guide

Popular examples in this category

Enclosed Latching Relay, 20A, 24VAC/DCEnclosed Latching Relay, 20A, 24VAC/DCWBB103427610A NEMA 4/4X DPDT Enclosed Relay10A NEMA 4/4X DPDT Enclosed RelayWBB1034283Enclosed Power Relay, 20A, 3PST-NC, 480VACEnclosed Power Relay, 20A, 3PST-NC, 480VACWBB1034423Enclosed Solid-Core AC Current Sensor Relay, 0.25–150A, SPSTEnclosed Solid-Core AC Current Sensor Relay, 0.25–150A, SPSTWBB1034059
Use Cases

Match the relay to the job

Use latching relays where pulse commands and retained contact state are needed. Choose fan relays for 24V fan switching, polarized relays for supervised control systems, and current sensor relays for AC current detection or monitoring.

How to Choose

Compare electrical and switching requirements

Confirm the listed operating or control voltage, required amp rating, and contact configuration. Options represented include SPST, SPDT, DPDT, 2 SPDT, 3PST-NC, and current-sensing outputs.

Applications

Plan around the installation format

Enclosed assemblies can combine relay-related components in one package, while track-mount options provide an enclosed format for track-mounted installation. Compact dimensions can also matter in space-conscious control installations.

Additional Information

Look for integrated control features

Available features include LED status indication, manual override, mechanically latched contacts, transient protection, network compatibility, fixed terminals, and wire leads. Current-monitoring models may provide switching output or a 4-20 mA signal.

10A-20ARelay ratings represented

Available relay options include listed 10A, 15A, and 20A capacities.

0.25-150ASolid-core sensing range

One enclosed solid-core AC current sensor relay detects current across this stated range.

4-20 mAMonitoring output option

A split-core AC current sensor model provides this transmitter output.

7 x 4.28 x 2 in.Network relay footprint

The network-compatible relay has these listed width, depth, and height dimensions.

Comparison Guide

Compare relay types in this category

Use this overview to narrow the product type before reviewing the listed voltage, contact arrangement, rating, and integrated features for the specific installation.

Relay typeWhat it providesKey selection points
Enclosed and track-mount switching relaysSPST, SPDT, DPDT, 2 SPDT, or 3PST-NC switching in enclosed or track-mount formats.Compare control voltage, amp rating, contact arrangement, LED indication, override, and mounting format.
Latching and specialized control relaysMechanically latched contacts, fan switching, or polarized-coil support for supervised systems.Confirm whether retained state, fan-control use, or supervised-system compatibility is required.
AC current sensor relaysSolid-core or split-core AC sensing with SPST switching or 4-20 mA output.Compare sensing range, fixed versus adjustable sensing point, sensor core style, and required output.
Planning Guide

Plan the right fit before choosing

Switching relays

Select contacts and ratings for the connected control circuit

Relay options in this category range from 10A to 20A and include several contact arrangements. A straightforward SPST option suits compatible single-pole switching needs, while SPDT and DPDT configurations offer changeover contacts. Other available arrangements include 2 SPDT and 3PST-NC.

  • Choose 10A, 15A, or 20A capacity based on the stated application requirement.
  • Compare SPST, SPDT, DPDT, 2 SPDT, and 3PST-NC contact arrangements.
  • Check listed operation options such as 24VAC/DC, 24 VAC/VDC, 10-30 VAC/DC, 120 VAC, or 480VAC.
  • Consider a manual override when servicing capability is needed.
Current sensing and monitoring

Choose sensing type and output for the control equipment

Current sensor models are designed to detect or monitor AC current. Solid-core and split-core designs are represented, with fixed and adjustable sensing ranges. The output type is an important distinction: one sensor relay provides SPST switching, while another sends a 4-20 mA transmitter signal to compatible control equipment.

  • Solid-core sensing is available with a 0.25-150A sensing range and SPST switching.
  • Split-core options include a fixed 1-50A range with 4-20 mA output.
  • An adjustable split-core sensor allows a trigger point from 0.75 to 150A.
  • Verify whether the application needs a switching output or a transmitter signal.
Enclosures and packaged assemblies

Evaluate mounting, packaging, and built-in indicators

Many relays are enclosed and prepackaged to bring together relay-related components for installation. Certain assemblies include items such as an LED indicator, socket, mounting rail, transient protection, and housing. Available enclosure and mounting details include NEMA 1 plastic, NEMA 4/4X, track-mount formats, mounting nipples, wire leads, and fixed terminals.

  • Select a listed enclosure designation or installation format appropriate to the project.
  • Use compact dimensions as a comparison point where installation space is limited.
  • Choose LED-equipped models when a visible status indication is useful.
  • For distributed control installations, consider the network-compatible relay with integrated current sensing.
FAQ

Common questions before buying

What relay contact configurations are available?

Represented configurations include SPST, SPDT, DPDT, 2 SPDT, and 3PST-NC.

Are current-monitoring options available?

Yes. The category includes solid-core and split-core AC current sensor models with switching output or 4-20 mA output.

Which relays have an LED indicator?

Several enclosed and track-mount relay assemblies include an LED indicator, including certain 10A, 15A, and 20A relay options.

What control voltages are represented?

Listed options include 24VAC/DC, 24 VAC/VDC, 10-30 VAC/DC, 120 VAC, and 480VAC, depending on the relay.

Helpful Buying Guide

Choose a relay for the control function you need

Start with the required function: switching a load, retaining a contact state, supporting a supervised circuit, controlling a fan, or sensing AC current. Then compare control voltage, contact arrangement, electrical rating, enclosure or mounting format, and any integrated features such as LED indication, override capability, current sensing, or transmitter output.

Visual Guide

Popular examples in this category

Enclosed Latching Relay, 20A, 24VAC/DCEnclosed Latching Relay, 20A, 24VAC/DCWBB103427610A NEMA 4/4X DPDT Enclosed Relay10A NEMA 4/4X DPDT Enclosed RelayWBB1034283Enclosed Power Relay, 20A, 3PST-NC, 480VACEnclosed Power Relay, 20A, 3PST-NC, 480VACWBB1034423Enclosed Solid-Core AC Current Sensor Relay, 0.25–150A, SPSTEnclosed Solid-Core AC Current Sensor Relay, 0.25–150A, SPSTWBB1034059
Use Cases

Match the relay to the job

Use latching relays where pulse commands and retained contact state are needed. Choose fan relays for 24V fan switching, polarized relays for supervised control systems, and current sensor relays for AC current detection or monitoring.

How to Choose

Compare electrical and switching requirements

Confirm the listed operating or control voltage, required amp rating, and contact configuration. Options represented include SPST, SPDT, DPDT, 2 SPDT, 3PST-NC, and current-sensing outputs.

Applications

Plan around the installation format

Enclosed assemblies can combine relay-related components in one package, while track-mount options provide an enclosed format for track-mounted installation. Compact dimensions can also matter in space-conscious control installations.

Additional Information

Look for integrated control features

Available features include LED status indication, manual override, mechanically latched contacts, transient protection, network compatibility, fixed terminals, and wire leads. Current-monitoring models may provide switching output or a 4-20 mA signal.

10A-20ARelay ratings represented

Available relay options include listed 10A, 15A, and 20A capacities.

0.25-150ASolid-core sensing range

One enclosed solid-core AC current sensor relay detects current across this stated range.

4-20 mAMonitoring output option

A split-core AC current sensor model provides this transmitter output.

7 x 4.28 x 2 in.Network relay footprint

The network-compatible relay has these listed width, depth, and height dimensions.

Comparison Guide

Compare relay types in this category

Use this overview to narrow the product type before reviewing the listed voltage, contact arrangement, rating, and integrated features for the specific installation.

Relay typeWhat it providesKey selection points
Enclosed and track-mount switching relaysSPST, SPDT, DPDT, 2 SPDT, or 3PST-NC switching in enclosed or track-mount formats.Compare control voltage, amp rating, contact arrangement, LED indication, override, and mounting format.
Latching and specialized control relaysMechanically latched contacts, fan switching, or polarized-coil support for supervised systems.Confirm whether retained state, fan-control use, or supervised-system compatibility is required.
AC current sensor relaysSolid-core or split-core AC sensing with SPST switching or 4-20 mA output.Compare sensing range, fixed versus adjustable sensing point, sensor core style, and required output.
Planning Guide

Plan the right fit before choosing

Switching relays

Select contacts and ratings for the connected control circuit

Relay options in this category range from 10A to 20A and include several contact arrangements. A straightforward SPST option suits compatible single-pole switching needs, while SPDT and DPDT configurations offer changeover contacts. Other available arrangements include 2 SPDT and 3PST-NC.

  • Choose 10A, 15A, or 20A capacity based on the stated application requirement.
  • Compare SPST, SPDT, DPDT, 2 SPDT, and 3PST-NC contact arrangements.
  • Check listed operation options such as 24VAC/DC, 24 VAC/VDC, 10-30 VAC/DC, 120 VAC, or 480VAC.
  • Consider a manual override when servicing capability is needed.
Current sensing and monitoring

Choose sensing type and output for the control equipment

Current sensor models are designed to detect or monitor AC current. Solid-core and split-core designs are represented, with fixed and adjustable sensing ranges. The output type is an important distinction: one sensor relay provides SPST switching, while another sends a 4-20 mA transmitter signal to compatible control equipment.

  • Solid-core sensing is available with a 0.25-150A sensing range and SPST switching.
  • Split-core options include a fixed 1-50A range with 4-20 mA output.
  • An adjustable split-core sensor allows a trigger point from 0.75 to 150A.
  • Verify whether the application needs a switching output or a transmitter signal.
Enclosures and packaged assemblies

Evaluate mounting, packaging, and built-in indicators

Many relays are enclosed and prepackaged to bring together relay-related components for installation. Certain assemblies include items such as an LED indicator, socket, mounting rail, transient protection, and housing. Available enclosure and mounting details include NEMA 1 plastic, NEMA 4/4X, track-mount formats, mounting nipples, wire leads, and fixed terminals.

  • Select a listed enclosure designation or installation format appropriate to the project.
  • Use compact dimensions as a comparison point where installation space is limited.
  • Choose LED-equipped models when a visible status indication is useful.
  • For distributed control installations, consider the network-compatible relay with integrated current sensing.
FAQ

Common questions before buying

What relay contact configurations are available?

Represented configurations include SPST, SPDT, DPDT, 2 SPDT, and 3PST-NC.

Are current-monitoring options available?

Yes. The category includes solid-core and split-core AC current sensor models with switching output or 4-20 mA output.

Which relays have an LED indicator?

Several enclosed and track-mount relay assemblies include an LED indicator, including certain 10A, 15A, and 20A relay options.

What control voltages are represented?

Listed options include 24VAC/DC, 24 VAC/VDC, 10-30 VAC/DC, 120 VAC, and 480VAC, depending on the relay.

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