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

2826172

ST-REL3-KG230/21/AU

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Support plug-in relay, equipped with mini-relay switching contacts (AgPd60): Powers small, 1 change-over contact, input voltage 230 V AC, with light indication, plug-in terminal blocks base

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0901015

FBST 21-PLC GY

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Continuous plug-in bridge

Endless plug-in bridge, color: gray

Endless plug-in bridge, length: 21 mm, color: gray

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2823706

ST-REL2-KG120/2

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Relay connectors

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2942700

EMG 25-REL/KSR-24/21-21/SO16

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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

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

2829920

ZFK-RELG 4

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Basic terminal block

3 View Availability View Price

2946560

EMD 12-REL/KSR-G 24/21

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Relay Module

Relay module

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2892520

ST-REL7-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

2966223

PLC-RSC-24DC/ 1/SEN

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Relay Module

PLC-INTERFACE for input functions, consisting of PLC-BSC.../SEN base terminal block with screw connection and plug-in miniature relay with power contact, for mounting on NS 35/7.5 rail, 1 closing contact, input voltage 24 V DC

3 View Availability View Price

2944782

EMG 12-REL/KSR- 24/1AU

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Relay Module

Relay module with soldered switching mini-relay, contact (AgPd60 5 μm hard gold): medium to large powers, 1 open contact, input voltage 24 V AC/DC

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2943770

EMUG 45- 8REL/KSR-G 24/ 1

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Multiple relay module

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2911058

ST-OE3-24DC/ 48DC/100

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Solid-state relays

Pluggable solid-state input relay, with indicator light and protection circuit protection circuit in input and output circuit, input: 24 V DC, output: 8 - 48 V DC/max. 100 mA, pluggable to base terminal blocks

3 View Availability View Price

2833961

REL-IR/LDP- 60DC/4X21AU

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Single relay

3 View Availability View Price

2964843

EMG 25-REL/KSR-230/2X21AU/SO46

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Relay Module

Parasitic interference relay interfaces on the control side, with soldered mini-switching relays, contacts (Au): Small powers, 2 switched contacts, input voltage 230 V AC

Plug-in relay interfaces for protection against interference on the control side, with soldered-in miniature switching relay, contacts (Au): small loads, 2 changeover contacts, input voltage 230 V AC

3 View Availability View Price

2777069

UDK-RELG 7

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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..., 7-pole

3 View Availability View Price

2940294

DEK-OE-125DC/ 48DC/100/T

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Solid-state relay terminal block

Input solid-state relay terminal, input: 125 V DC, output: 3 - 48 V DC/100 mA, with interrupt plug on output, terminal width 6.2 mm

3 View Availability View Price

2905051

ST-OV2-110DC/ 60DC/1

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Solid-state relays

Pluggable solid-state power relay, with indicator light and protection circuit in input and output circuit, input: 110 V DC, output: 12-60 V DC/max. 1 A, pluggable to base terminal blocks

Plug-in power solid-state relay, with LED and protective circuit in input and output circuits, input: 110 V DC, output: 12 - 60 V DC/max. 1 A, can be plugged into basic terminal blocks

3 View Availability View Price

2826486

ST-REL2-KG230AC/1AU

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Relay connectors

Plug-in relay bracket, equipped with mini-switching relay, contacts (AgPd60): Small powers, 1 open contact, input voltage 230 V AC, with light indication, pluggable into base terminal blocks

Relay connector, equipped with miniature switching relay, contacts (AgPd60): small loads, 1 N/O contact, input voltage 230 V AC, with light indicator, can be plugged on basic termination blocks

3 View Availability View Price

2911692

ST-OE2-24DC/ 48DC/100

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Solid-state relays

Pluggable solid-state input relay, with indicator light and protection circuit protection circuit in input and output circuit, input: 24 V DC, output: 8 - 48 V DC/max. 100 mA, pluggable to base terminal blocks

3 View Availability View Price

2947420

EMG 17-REL/KSR-12/21

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Relay Module

Relay module, with soldered mini-switching relay, contact (AgNi): Medium to high powers, double A2 connection, 1 switched contact, input voltage 12 V AC/DC

3 View Availability View Price

2943437

EMG 12-TR/INV

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Switching amplifier

Inverter module. The inverter module reverses the signals from the ground-connected NPN transistor outputs into positive-connected PNP outputs, as well as the PNP connection signals into NPN connection signals.

3 View Availability View Price

2829551

ST-REL4-KG 24/21-21/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 24 V AC/DC, with light indication, pluggable into base terminal blocks

3 View Availability View Price

2911715

ST-OE2-110DC/ 48DC/100

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Solid-state relays

3 View Availability View Price

2820149

URELG 4

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Basic terminal block

Base terminal blocks with screw connection for rail NS 32 and NS 35/7.5, with end cover, for ST-REL connectors..., ST-OV... and ST-OE..., 4-pole

3 View Availability View Price

2980490

PLC-RSC-230UC/21/SO46

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Relay Module

PLC-INTERFACE against eddy currents or eddy voltages on the control side, consisting of PLC-BSC.../21 base terminal block with screw connection and plug-in miniature relay with power contact, 1 switched contact, input voltage 230 V AC

PLC-INTERFACE against interfering currents or voltages on the control side, comprising a basic module PLC-BSC.../21 with screwed connection and plug-in miniature relay with power contact, 1 inverter contact, input voltage 230 V AC

3 View Availability View Price

2903228

ST-OV3-24DC/ 60DC/3

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Solid-state relays

Plug-in solid-state power relay, with light indicator and protection circuit in input and output circuit, input: 24 V DC, output: 12-60 V DC/max. 3 A, pluggable to base terminal blocks.

3 View Availability View Price

2821232

ST-REL3-KG 48/21

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Relay connectors

3 View Availability View Price

2823670

ST-REL2-KG 24/2

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Relay connectors

Plug-in relay holder, equipped with mini-switching relay, contacts (AgNi): Medium to large powers, 1 closed contact, input voltage 24 V AC/DC, with light indication, pluggable into base terminal blocks

3 View Availability View Price

2950996

EMG 45-RELS/IR1-G 24

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Relay base

Relay module, with 1 plug-in socket for size 1 industrial relays, contact: 4 switched contacts, input voltage 24-48 V DC, with light indication, freewheel diode and another against polarity reversal

3 View Availability View Price

2966032

PLC-BSC-120UC/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 120 V AC/DC

3 View Availability View Price

2271235

SIM-ERS

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Plug-in base

Plug-in socket, for mini-switching relays or pluggable miniature optocouplers, for soldering on the printed circuit board

3 View Availability View Price

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