.png){kind=small}
Control Relays
Ensure consistent performance and reliable operation in your electrical systems with our wide selection of control relays. Designed to provide safe and accurate switching, these essential components are used in motor control, automation, HVAC systems, and industrial machinery. Our offering includes general-purpose relays, timing relays, solid-state relays, and safety relays, available in multiple coil voltages and contact configurations to match your application. Built with durable materials and trusted designs, these relays deliver dependable performance while helping to protect equipment and extend system life. Whether you’re managing simple control circuits or complex automation systems, our control relays offer the reliability, flexibility, and efficiency professionals count on. With products from leading brands, it’s easy to find the right relay for your project.
Filters 566 Results
566 items
content loaded
The Dwyer - SSRL240DC25 is a High Reliability Solid State Relay featuring 1-Phase, 24 Vac to 280 Vac Line Voltage, 25 A, 3 Vdc to 32 Vdc O/P, DC Control Signal, and Screw Mount. Part of the SSRL Series. Sold individually.
$53.65
Should ship between 06 Mar and 13 Mar
Subject to factory lead times
The Dwyer - CH-50 is a Terminal Block for NB2 Type Connection Head featuring 4 Terminals, Ceramic Block with Nickel Plated Brass Terminals, 14 AWG, and White. Part of the CH Series. Sold individually.
Save 8%$15.37
$14.13
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - DRTB-RAIL-8 is a Pre-Cut DIN Rail for 8 " Sub-Panel Width featuring Perforated Steel with Electrolytic Zinc Plating. Part of the DRTB-RAIL Series. Sold individually.
Save 8%$12.36
$11.36
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - BS10A is a Barrier Strip featuring 10 Terminals, 16 AWG to 24 AWG, and Standard. Sold individually.
$25.61
Should ship between 20 Feb and 27 Feb
Subject to factory lead times
The Dwyer - AVK-4 is a Feed-Through Terminal Block featuring DIN Rail, 30 A, 600 Vac, 26 AWG to 10 AWG, 6 mm, Gray, and 10 mm (0.39 "). Part of the AVK Series. Sold individually.
$1.69
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - DRTB-RAIL-3575-1 is a Slotted DIN Rail 1.4 " x 0.3 " x 3.3 ' featuring Perforated Steel with Electrolytic Zinc Plating. Part of the DRTB-RAIL Series. Sold individually.
$7.80
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - AVK-2.5 is a Feed-Through Terminal Block featuring DIN Rail, 20 A, 600 Vac, 26 AWG to 12 AWG, 5 mm, Gray, and 10 mm (0.39 "). Part of the AVK Series. Sold individually.
$1.47
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - SSRL240DC10 is a High Reliability Solid State Relay featuring 1-Phase, 24 Vac to 280 Vac Line Voltage, 10 A, 3 Vdc to 32 Vdc O/P, DC Control Signal, and Screw Mount. Part of the SSRL Series. Sold individually.
$46.08
Should ship between 06 Mar and 13 Mar
Subject to factory lead times
The Dwyer - PUK-3 is a Feed Through Terminal Block featuring Multi-level, 24 A, 300 Vac, 24 AWG to 12 AWG, 6 mm (0.236 "), Gray, 9 mm (0.35 "), and Three level feed through Terminal Block. Part of the PUK Series. Sold individually.
$6.17
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - CG-7211981 is a Locknut featuring Polyamide, Gray, and M20. Part of the CG Series. Sold individually.
$1.27
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - ASK-2LD-DC is a Fuse Terminal Block with LED Blown Fuse Indicator featuring 6.3 A, 24 Vdc, 26 AWG to 8 AWG, 8 mm (0.315 "), Gray, 12 mm (0.47 "), and Fuse Size 5 mm x 20 mm & 5 x 25 mm. Part of the ASK T-Block Series. Sold individually.
$11.55
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - ASK-2S is a Fuse Terminal Block featuring 6.3 A, 300 Vac, 26 AWG to 8 AWG, 8 mm (0.315 "), Gray, 12 mm (0.47 "), and Fuse Size 5 mm x 20 mm & 5 mm x 25 mm. Part of the ASK T-Block Series. Sold individually.
$6.97
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - SSRL240DC50 is a High Reliability Solid State Relay featuring 1-Phase, 24 Vac to 280 Vac Line Voltage, 50 A, 3 Vdc to 32 Vdc O/P, DC Control Signal, and Screw Mount. Part of the SSRL Series. Sold individually.
$79.12
Should ship between 06 Mar and 13 Mar
Subject to factory lead times
The Dwyer - SSRDIN660AC25 is an Electronics Acc's: SSR Relays featuring SINGLE-PHASE SSR CE. Sold individually.
$109.44
Should ship between 03 Nov and 05 Nov
Subject to factory lead times
The Dwyer - AVK-4-B is a Feed-Through Terminal Block featuring DIN Rail, 30 A, 600 Vac, 26 AWG to 10 AWG, 6 mm, Blue, and 10 mm (0.39 "). Part of the AVK Series. Sold individually.
$1.69
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - SSRL240AC10 is a High Reliability Solid State Relay featuring 1-Phase, 24 Vac to 280 Vac Line Voltage, 10 A, 90 Vac to 280 Vac O/P, AC Control Signal, and Screw Mount. Part of the SSRL Series. Sold individually.
$51.81
Should ship between 06 Mar and 13 Mar
Subject to factory lead times
The Dwyer - AVK-6 is a Feed-Through Terminal Block featuring DIN Rail, 50 A, 600 Vac, 26 AWG to 8 AWG, 8 mm, Gray, and 12 mm (0.47 "). Part of the AVK Series. Sold individually.
$1.91
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - OMTBV7-WFB4 is a Fuse Terminal Block featuring DIN Rail, 15 A, 300 Vac/500 Vac, 22 AWG to 12 AWG, 50.7 mm (2 "), Black, 8 mm (0.31 "), and 50.7 mm x 39.4 mm (W x H). Part of the OMTBV7-W Series. Sold individually.
$19.15
Should ship between 04 Mar and 14 Mar
Subject to factory lead times
The Dwyer - SSRDIN600DC20 is a Solid State Relay featuring 1-Phase, 48 Vac to 600 Vac Line Voltage, 20 A, 4 Vdc to 32 Vdc SCR O/P, DC Control Signal, and DIN Rail Mount. Part of the SSRDIN Series. Sold individually.
$122.30
Should ship between 06 Mar and 13 Mar
Subject to factory lead times
The Dwyer - DRTB-RAIL-3515-1 is a Slotted DIN Rail 1.4 " x 0.6 " x 3.3 ' featuring Perforated Steel with Electrolytic Zinc Plating. Part of the DRTB-RAIL Series. Sold individually.
$11.91
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - SSRL240AC25 is a High Reliability Solid State Relay featuring 1-Phase, 24 Vac to 280 Vac Line Voltage, 25 A, 90 Vac to 280 Vac O/P, AC Control Signal, and Screw Mount. Part of the SSRL Series. Sold individually.
$63.91
Should ship between 06 Mar and 13 Mar
Subject to factory lead times
The Dwyer - DRTB-RAIL-3575 is a Slotted DIN Rail 1.4 " x 0.3 " x 6.6 ' featuring Perforated Steel with Electrolytic Zinc Plating. Part of the DRTB-RAIL Series. Sold individually.
$14.46
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - DRTB-RAIL-12 is a Pre-Cut DIN Rail for 12 " Sub-Panel Width featuring Perforated Steel with Electrolytic Zinc Plating. Part of the DRTB-RAIL Series. Sold individually.
Save 8%$14.72
$13.53
Should ship between 14 Nov and 21 Nov
Subject to factory lead times
The Dwyer - DRTB-RAIL-20 is a Pre-Cut DIN Rail for 20 " Sub-Panel Width featuring Perforated Steel with Electrolytic Zinc Plating. Part of the DRTB-RAIL Series. Sold individually.
Save 8%$14.43
$13.26
Should ship between 05 Nov and 10 Nov
Subject to factory lead times
The Dwyer - SSRL240DC25 is a High Reliability Solid State Relay featuring 1-Phase, 24 Vac to 280 Vac Line Voltage, 25 A, 3 Vdc to 32 Vdc O/P, DC Control Signal, and Screw Mount. Part of the SSRL Series. Sold individually.
$53.65
Should ship between 06 Mar and 13 Mar
Subject to factory lead times
The Dwyer - CH-50 is a Terminal Block for NB2 Type Connection Head featuring 4 Terminals, Ceramic Block with Nickel Plated Brass Terminals, 14 AWG, and White. Part of the CH Series. Sold individually.
Save 8%$15.37
$14.13
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - DRTB-RAIL-8 is a Pre-Cut DIN Rail for 8 " Sub-Panel Width featuring Perforated Steel with Electrolytic Zinc Plating. Part of the DRTB-RAIL Series. Sold individually.
Save 8%$12.36
$11.36
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - BS10A is a Barrier Strip featuring 10 Terminals, 16 AWG to 24 AWG, and Standard. Sold individually.
$25.61
Should ship between 20 Feb and 27 Feb
Subject to factory lead times
The Dwyer - AVK-4 is a Feed-Through Terminal Block featuring DIN Rail, 30 A, 600 Vac, 26 AWG to 10 AWG, 6 mm, Gray, and 10 mm (0.39 "). Part of the AVK Series. Sold individually.
$1.69
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - DRTB-RAIL-3575-1 is a Slotted DIN Rail 1.4 " x 0.3 " x 3.3 ' featuring Perforated Steel with Electrolytic Zinc Plating. Part of the DRTB-RAIL Series. Sold individually.
$7.80
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - AVK-2.5 is a Feed-Through Terminal Block featuring DIN Rail, 20 A, 600 Vac, 26 AWG to 12 AWG, 5 mm, Gray, and 10 mm (0.39 "). Part of the AVK Series. Sold individually.
$1.47
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - SSRL240DC10 is a High Reliability Solid State Relay featuring 1-Phase, 24 Vac to 280 Vac Line Voltage, 10 A, 3 Vdc to 32 Vdc O/P, DC Control Signal, and Screw Mount. Part of the SSRL Series. Sold individually.
$46.08
Should ship between 06 Mar and 13 Mar
Subject to factory lead times
The Dwyer - PUK-3 is a Feed Through Terminal Block featuring Multi-level, 24 A, 300 Vac, 24 AWG to 12 AWG, 6 mm (0.236 "), Gray, 9 mm (0.35 "), and Three level feed through Terminal Block. Part of the PUK Series. Sold individually.
$6.17
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - CG-7211981 is a Locknut featuring Polyamide, Gray, and M20. Part of the CG Series. Sold individually.
$1.27
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - ASK-2LD-DC is a Fuse Terminal Block with LED Blown Fuse Indicator featuring 6.3 A, 24 Vdc, 26 AWG to 8 AWG, 8 mm (0.315 "), Gray, 12 mm (0.47 "), and Fuse Size 5 mm x 20 mm & 5 x 25 mm. Part of the ASK T-Block Series. Sold individually.
$11.55
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - ASK-2S is a Fuse Terminal Block featuring 6.3 A, 300 Vac, 26 AWG to 8 AWG, 8 mm (0.315 "), Gray, 12 mm (0.47 "), and Fuse Size 5 mm x 20 mm & 5 mm x 25 mm. Part of the ASK T-Block Series. Sold individually.
$6.97
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - SSRL240DC50 is a High Reliability Solid State Relay featuring 1-Phase, 24 Vac to 280 Vac Line Voltage, 50 A, 3 Vdc to 32 Vdc O/P, DC Control Signal, and Screw Mount. Part of the SSRL Series. Sold individually.
$79.12
Should ship between 06 Mar and 13 Mar
Subject to factory lead times
The Dwyer - SSRDIN660AC25 is an Electronics Acc's: SSR Relays featuring SINGLE-PHASE SSR CE. Sold individually.
$109.44
Should ship between 03 Nov and 05 Nov
Subject to factory lead times
The Dwyer - AVK-4-B is a Feed-Through Terminal Block featuring DIN Rail, 30 A, 600 Vac, 26 AWG to 10 AWG, 6 mm, Blue, and 10 mm (0.39 "). Part of the AVK Series. Sold individually.
$1.69
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - SSRL240AC10 is a High Reliability Solid State Relay featuring 1-Phase, 24 Vac to 280 Vac Line Voltage, 10 A, 90 Vac to 280 Vac O/P, AC Control Signal, and Screw Mount. Part of the SSRL Series. Sold individually.
$51.81
Should ship between 06 Mar and 13 Mar
Subject to factory lead times
The Dwyer - AVK-6 is a Feed-Through Terminal Block featuring DIN Rail, 50 A, 600 Vac, 26 AWG to 8 AWG, 8 mm, Gray, and 12 mm (0.47 "). Part of the AVK Series. Sold individually.
$1.91
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - OMTBV7-WFB4 is a Fuse Terminal Block featuring DIN Rail, 15 A, 300 Vac/500 Vac, 22 AWG to 12 AWG, 50.7 mm (2 "), Black, 8 mm (0.31 "), and 50.7 mm x 39.4 mm (W x H). Part of the OMTBV7-W Series. Sold individually.
$19.15
Should ship between 04 Mar and 14 Mar
Subject to factory lead times
The Dwyer - SSRDIN600DC20 is a Solid State Relay featuring 1-Phase, 48 Vac to 600 Vac Line Voltage, 20 A, 4 Vdc to 32 Vdc SCR O/P, DC Control Signal, and DIN Rail Mount. Part of the SSRDIN Series. Sold individually.
$122.30
Should ship between 06 Mar and 13 Mar
Subject to factory lead times
The Dwyer - DRTB-RAIL-3515-1 is a Slotted DIN Rail 1.4 " x 0.6 " x 3.3 ' featuring Perforated Steel with Electrolytic Zinc Plating. Part of the DRTB-RAIL Series. Sold individually.
$11.91
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - SSRL240AC25 is a High Reliability Solid State Relay featuring 1-Phase, 24 Vac to 280 Vac Line Voltage, 25 A, 90 Vac to 280 Vac O/P, AC Control Signal, and Screw Mount. Part of the SSRL Series. Sold individually.
$63.91
Should ship between 06 Mar and 13 Mar
Subject to factory lead times
The Dwyer - DRTB-RAIL-3575 is a Slotted DIN Rail 1.4 " x 0.3 " x 6.6 ' featuring Perforated Steel with Electrolytic Zinc Plating. Part of the DRTB-RAIL Series. Sold individually.
$14.46
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - DRTB-RAIL-12 is a Pre-Cut DIN Rail for 12 " Sub-Panel Width featuring Perforated Steel with Electrolytic Zinc Plating. Part of the DRTB-RAIL Series. Sold individually.
Save 8%$14.72
$13.53
Should ship between 14 Nov and 21 Nov
Subject to factory lead times
The Dwyer - DRTB-RAIL-20 is a Pre-Cut DIN Rail for 20 " Sub-Panel Width featuring Perforated Steel with Electrolytic Zinc Plating. Part of the DRTB-RAIL Series. Sold individually.
Save 8%$14.43
$13.26
Should ship between 05 Nov and 10 Nov
Subject to factory lead times
FAQ
- A control relay is an electrically operated switch that lets a low-power signal (from a PLC, controller, or panel) switch a higher-power load (motors, valves, heaters, lamps). They isolate the control side from the load side, multiply contacts, and let you build interlock logic without putting big loads through your control circuits.
- Electromechanical relays use a coil to physically move a set of metal contacts. Cheap, fast to spec, handle inrush well, and you can hear them click. They wear out mechanically (millions of cycles). Solid-state relays use semiconductors to switch the load, no moving parts. Much longer life, silent, faster switching, but they need heat sinking and don't tolerate short-circuit faults the way EM relays do. EM for occasional switching of motors and high-inrush loads, SSR for fast or high-cycle switching of resistive loads.
- Match three things: contact rating (voltage and current of the load), coil voltage (matches your control signal, usually 24 VDC, 120 VAC, or 240 VAC), and number of poles (how many circuits switch together). For inductive loads (motors, solenoids), de-rate the contact current by 30-50%. For high-cycle applications, look at expected mechanical life.
Download Line Card
Download the NISCO Inc. Line Card to view all brands and products NISCO Inc. distributes and/or represents.
About NISCO Inc.
NISCO offers a wide range of pressure gauges & instruments, diaphragm seals, thermometers, valves, and flow control products to the industrial and commercial marketplaces, as well as other resellers like ourselves. We can also provide other value-added services such as gauge repair, NIST traceable calibration, diaphragm seal assembly, and valve automation. NISCO takes pride in providing extensive product knowledge, helpful customer service, and market competitive pricing to help fit whatever need you may have because it is our goal to be regarded by our customers as the best supplier of pressure, temperature, and flow control products.