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Industrial Relays

Industrial Relays: Precision Switching for Automation Systems

Industrial relays are electromechanical or solid-state switching devices designed to control high-power circuits using low-power control signals. These components are fundamental in automation systems, providing galvanic isolation between control and load circuits. Key technical parame...

Industrial Relays: Precision Switching for Automation Systems

Industrial relays are electromechanical or solid-state switching devices designed to control high-power circuits using low-power control signals. These components are fundamental in automation systems, providing galvanic isolation between control and load circuits. Key technical parameters include coil voltage (typically 12V DC to 240V AC), contact configuration (SPST, DPDT, 4PDT), rated current (from 5A to 30A), and switching frequency. Industrial relays are available in various form factors such as socket-mounted, PCB-mounted, and interface modules, with options for LED indication, freewheeling diodes, and mechanical interlocks. They are essential for logic control, signal amplification, and load management in industrial environments.

Applications and Sectors

Industrial relays are deployed across a wide range of sectors including manufacturing, energy, transportation, and building automation. In manufacturing, they control motors, solenoids, and valves in assembly lines. In energy distribution, they manage switching in substations and renewable energy systems. Transportation systems use relays for signaling and traction control. Building automation relies on relays for HVAC, lighting, and security systems. They are commonly installed in control panels, PLC cabinets, and distributed I/O stations, often in harsh environments requiring IP20 or higher protection.

Subcategories and Key Articles

Key subcategories include general-purpose relays, safety relays, time-delay relays, and solid-state relays. General-purpose relays like the Finder 55.34.9.024.0040 (4PDT, 24V DC coil, 10A) are widely used. Safety relays such as the Pilz PNOZ X3 (3 safety contacts, 24V DC) ensure machine safety. Time-delay relays like the Omron H3CR-A8 (multi-range, 0.1s to 1200s) provide timing functions. Solid-state relays like the Crydom D2425 (25A, 24-280V AC) offer silent, high-speed switching. Article codes often follow patterns like [Brand][Series][Coil Voltage][Contact Configuration], e.g., "55.34.9.024.0040" for Finder.

Business Benefits and Support

Electric Automation Network offers express worldwide shipping and specialized technical support from experienced engineers. We provide real-time pricing, detailed technical documentation per article, and personalized assistance for relay selection, application design, and troubleshooting. Our multilingual portal ensures seamless procurement for global projects.

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Manufacturer Code Reference Catalog Number Description Delivery Price

2827139

ST-REL7-HG 24/4X21

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Relay connectors

Plug-in relay holder, equipped with Hengstler mini-round-relay, contacts (AgSnO2+Au): Small to large powers, 4 switched contacts, input voltage 24 V DC, with light indication, pluggable into base terminal blocks

3 View Availability View Price

2823308

ST-REL4-KG 24/21-21

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Relay connectors

Plug-in relay bracket, equipped with mini-switching relay, contacts (AgNi): Medium to large powers, 2 switched contacts, input voltage 24 V AC/DC, with light indication, pluggable into base terminal blocks

3 View Availability View Price

2907060

RIF-BR-12-230 AC

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Plug-in module

Plug-in module, for mounting on RIF-1, RIF-2, RIF-3 and RIF-4, with bridge rectifier, input voltage: 12 V AC ... 230 V AC

Plug-in module, for mounting on RIF-1, RIF-2, RIF-3 and RIF-4, with bridge rectifier, input voltage: 12 V AC ... 230 V AC

3 View Availability View Price

2942674

EMK 12-REL/MSR- 24/1AU

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Relay Module

customer-specific relay module, 1 NO contact, input voltage 24 V AC/DC

Customer-specific relay module, 1 N/O contact, 24 V AC/DC input voltage

3 View Availability View Price

2822422

ST-REL4-KG230/ 1-1

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Relay connectors

Plug-in relay bracket, equipped with mini-switching relay, contacts (AgNi): Medium to large powers, 2 open contacts, input voltage 230 V AC/DC, with light indication, pluggable into base terminal blocks

3 View Availability View Price

2829917

ZFK-RELG 3

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Basic terminal block

Spring-loaded base terminal blocks for NS 35/7.5 rail, with end cap, for ST-REL..., ST-OV... connectors. and ST-OE..., 3-pole

3 View Availability View Price

2900280

PLC-BPT-120UC/21

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Relay base

6.2 mm PLC base terminal block with push-in connection, without relay or solid-state relay equipment, for mounting on NS 35/7.5 rail, 1 switched contact, input voltage 120 V AC/DC

6.2 mm PLC basic terminal block with Push-in connection, without relay or solid-state relay, for mounting on DIN rail NS 35/7,5, 1 changeover contact, input voltage 120 V AC/DC

3 View Availability View Price

2900281

PLC-BPT-230UC/21

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Relay base

6.2 mm PLC base terminal block with push-in connection, without relay or solid-state relay equipment, for mounting on NS 35/7.5 rail, 1 switched contact, input voltage 230 V AC/DC

6.2 mm PLC basic terminal with push-in connection, without relay or solid-state relay assembly, for mounting on DIN rail NS 35/7.5, 1 changeover, input voltage 230 V AC/DC

3 View Availability View Price

2950323

EMG 22-REL/KSR-24/21-21

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Relay Module

Relay module, with soldered mini-switching relay, contact (AgNi): Medium to large powers, 2 switched contacts, input voltage 24 V AC/DC

3 View Availability View Price

2905048

ST-OV2- 60DC/ 60DC/1

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Solid-state relays

3 View Availability View Price

2301859

SIM-EI-2 OV- 24DC/ 24DC/2

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Solid state relay, miniature

3 View Availability View Price

2964254

DEK-OE-24DC/ 48DC/100/T

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Solid-state relay terminal block

Input solid-state relay terminal, input: 24 V DC, output: 3 - 48 V DC/100 mA, with interrupt plug on output, terminal width 6.2 mm

3 View Availability View Price

2987286

PLC-RSC-220DC/21AU

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Relay Module

PLC-INTERFACE, consisting of PLC-BSC.../21 base terminal block with screw connection and plug-in miniature relay with multi-layer gold contact, for mounting on NS 35/7.5 rail, 1 switched contact, input voltage 220 V DC

3 View Availability View Price

2953977

EMG 22-REL/KSR-120/21-21

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Relay Module

Relay module, with soldered mini-switching relay, contact (AgNi): Medium to large powers, 2 switched contacts, input voltage 120 V AC/DC

3 View Availability View Price

2826431

ST-REL4-KG230/21-21/AU

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Relay connectors

Plug-in relay support, equipped with mini-switching relay, contacts (AgNi+Au): Small to large powers, 2 switched contacts, input voltage 230 V AC/DC, with light indication, pluggable into base terminal blocks

3 View Availability View Price

2947491

EMG 17-REL/SG-B 60/21/P

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Relay Module

3 View Availability View Price

2946366

EMG 17-REL/KSR-24/21/SO54

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Relay Module

Relay module, with soldered mini-switching relay, contact (AgNi): Medium to high powers, 1 switched contact, input voltage 24 V AC/DC

Relay module, with soldered-in miniature switching relay, contact (AgNi): Medium to large loads, 1 PDT, input voltage 24 V AC/DC

3 View Availability View Price

2821106

ST-REL3-KG 60/21

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Relay connectors

Plug-in relay bracket, equipped with mini-switching relay, contacts (AgNi): Medium to high powers, 1 switched contact, input voltage 60 V AC/DC, with light display, pluggable into base terminal blocks

3 View Availability View Price

2823641

ST-REL2-KG 60/1

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Relay connectors

Plug-in relay bracket, equipped with mini-switching relay, contacts (AgNi): Medium to large powers, 1 open contact, input voltage 60 V AC/DC, with light indication, pluggable into base terminal blocks

3 View Availability View Price

2905491

ST-OV2-24DC/ 24DC/5

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Solid-state relays

Pluggable solid-state power relay, with indicator light and protection circuit in input and output circuit, input: 24 V DC, output: 3-30 V DC/max. 5 A, pluggable to base terminal blocks

3 View Availability View Price

2298852

ST-REL4-KG 48/21-21AU

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Relay connectors

Customer-specific relay connector, can be plugged into basic terminal blocks

3 View Availability View Price

2852353

ST-REL4-KG 24/ 1-1

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Relay connectors

Plug-in relay bracket, equipped with mini-switching relay, contacts (AgNi): Medium to large powers, 2 open contacts, input voltage 24 V AC/DC, with light indication, pluggable into base terminal blocks

Relay connector, fitted with miniature switching relay, contacts (AgNi): Medium to large loads, 2 N/O contacts, 24 V AC/DC input voltage, with light indicator, can be plugged into basic terminal blocks

3 View Availability View Price

2966045

PLC-BSC-230UC/21

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Relay base

6.2 mm PLC base terminal block with screw connection, without relay or solid-state relay equipment, for mounting on NS 35/7.5 rail, 1 switched contact, input voltage 230 V AC/DC

3 View Availability View Price

2980610

PLC-OSC-24DC/ 24DC/ 3RW

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Solid-state relay module

PLC-INTERFACE for railway applications, consisting of screw terminal block and integrated miniature solid-state relay, range: 0.7 x UN to 1.25 x UN, temperature range: -25 °C to +70 °C, 1 closing contact, input: 24 V DC, output: 3-33 V DC/3 A

PLC-INTERFACE for railway applications, consisting of basic terminal block with screw connection and integrated miniature solid-state relay, range: 0.7 x UN to 1.25 x UN, temperature range: -25°C to +70°C, 1 N/O contact, input: 24 V DC, output: 3 - 33 V DC/3 A

3 View Availability View Price

2777030

UDK-RELG 2

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Basic terminal block

Base terminal blocks with test socket on both sides and double connections of equal potential for NS 32 and NS 35/7.5 rails, with end cap, for ST-REL..., ST-OV... and ST-OE..., 2-pole

3 View Availability View Price

2955098

UM-RH 1004/4X21/G 24

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Relay base

3 View Availability View Price

2820712

URELG 4-PMTK

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Basic terminal block

Base terminal blocks with test socket on both sides and knife interrupt for NS 32 and NS 35/7.5 rail, with end cap, for ST-REL..., ST-OV... connectors and ST-OE..., 4-pole

3 View Availability View Price

2955195

UM-RH 1004/4X21/G 60

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Relay base

3 View Availability View Price

2822024

ST-REL3-SG 60/21

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Relay connectors

3 View Availability View Price

2908043

RIF-RHS-2

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Retaining bracket

Reinforced relay fixing bracket, with ejection function and housing for marking material, suitable for RIF-2 relay socket, for industrial relays

3 View Availability View Price

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