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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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PDF CATALOG PHOENIX INTERFACE TECHNOLOGY AND SWITCHING DEVICES EN
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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

 		3 View Availability View Price

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

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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

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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2956411

EMG 17-REL/SG-B 24/21/P

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Relay Module

Relay module, with soldered remnant switching mini-relay, with positive-switched diode circuit, contacts (AgSnO): small to large powers, 1 switched contact, 24 V DC input voltage

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2823735

ST-REL2-KG 48/1AU

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Relay connectors

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2953935

EMG 17-REL/SG-B 48/21/M

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Relay Module

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2833958

REL-IR/LDP- 60DC/2X21

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Single relay

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2940281

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

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Solid-state relay terminal block

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2834106

REL-IR/LDP- 48DC/4X21AU

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Single relay

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2905080

ST-OV2-230AC/ 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: 230 V AC, output: 12-60 V DC/max. 1 A, pluggable to base terminal block

Pluggable solid-state power relay, with indicator light and protection circuit in input and output circuit, input: 230 V AC, output: 12-60 V DC/max. 1 A, pluggable to base terminal block

 		3 View Availability View Price

2826473

ST-REL2-KG220DC/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 220 V DC, with light indication, pluggable into base terminal blocks

 		3 View Availability View Price

2952172

EMG 45-REL/IR-G 24/HWR

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Relay Module

Relay module, with soldered industrial relay, contact: 2 switched contacts, for collective fault messages, with input diode gate in polarity P (6 diodes 1N4007) and capacitor parallel to the coil, as well as collective light display, input voltage 24 V DC

 		3 View Availability View Price

2903639

ST-OV3- 5DC/240AC/3

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Solid-state relays

Pluggable solid-state power relay, with indicator light and protection circuit in input and output circuit, input: 5 V DC, output: 24-280 V AC/max. 3 A, pluggable to base terminal blocks

Pluggable solid-state power relay, with indicator light and protection circuit in input and output circuit, input: 5 V DC, output: 24-280 V AC/max. 3 A, pluggable to base terminal blocks

 		3 View Availability View Price

2944795

EMG 22-REL/KSR-W230/21-21

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Relay Module

Relay module, with soldered remnant switching mini-relay, contact (AgNi): medium to large powers, 2 switches, 230 V AC/DC input voltage

 		3 View Availability View Price

2300957

UMK- 8 RM/REL-MR 24/1/SO93

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Module VARIOFACE module of relays 8, 2 contactors, investors, contact material (AgNi 90/10), input voltage 24 V DC

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2947718

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

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Relay Module

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

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2864639

DB 50-90 RD

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Wire bridge

Flexible wire loop bridge, 50 poles, cable cross-section: 0.5 mm², loop length: 90 mm, ferrule length: 8 mm, colour: red

 		3 View Availability View Price

2823418

ST-REL4-HG 60/21-21

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Relay connectors

Plug-in relay holder, equipped with Hengstler mini-round-relay, contacts (AgSnO2+Au): Small to large powers, 2 switched contacts, input voltage 60 V DC, with light indication, pluggable into base terminal blocks

 		3 View Availability View Price

2820262

URELG 2

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Basic terminal block

Base terminal blocks with screw connection for NS 32 and NS 35/7.5 rails, with end cap, for ST-REL..., ST-OV... connectors. and ST-OE..., 2-pole

 		3 View Availability View Price

2892465

ST-REL7-HG220/4X21

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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 220 V DC, with light indication, pluggable into base terminal blocks

 		3 View Availability View Price

2298865

ST-REL7-KG220/4X21AU

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Relay connectors

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2823337

ST-REL4-KG120/21-21

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Relay connectors

Plug-in relay bracket, equipped with mini-switching relay, contacts (AgNi): Medium to high powers, 2 switched contacts, input voltage 120 V AC/DC, with light indication, pluggable into base terminal blocks

 		3 View Availability View Price

2907052

REL-IR2/100AC/2X21

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Single relay

Industrial plug-in relay with power contacts, 2 inverters, test key, mechanical switching position indicator, polarity: bipolar, input voltage: 100 V AC

 		3 View Availability View Price

2907053

REL-IR2/200AC/2X21

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Single relay

Plug-in industrial relay with power contacts, 2 inverters, test key, mechanical switching position indicator, polarity: bipolar, input voltage: 200 V AC

 		3 View Availability View Price

2907056

REL-IR4/200AC/4X21

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Single relay

Plug-in industrial relay with power contacts, 4 inverters, test key, mechanical switching position indicator, polarity: bipolar, input voltage: 200 V AC

 		3 View Availability View Price

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