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

2311700

EMG 10-OE-230AC/48DC/100/SO218

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Solid-state relay module

Input solid-state relay, with indicator light and protection circuit in the output and input circuit, input: 230 V AC, output: 4 V DC - 48 V DC/max. 35 mA, customer-specific variant for 50 Hz triggering

3 View Availability View Price

2909738

REL-IR4/24DC/4X21/EX

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Single relay

Plug-in industrial relay, RT III sealed with power contacts, 4 switched contacts, mechanical switching position indicator, polarity: no polarity, input voltage: 24 V DC in combination with RIF-2.../EX sockets approved according to ATEX/IECEx (zone 2) and Ex zone class I, div. 2.

Plug-in industrial relay, RT III sealed with power contacts, 4 switched contacts, mechanical switching position indicator, polarity: no polarity, input voltage: 24 V DC in combination with RIF-2.../EX sockets approved according to ATEX/IECEx (zone 2) and Ex zone class I, div. 2.

3 View Availability View Price

2909739

RIF-2-RPT-LV-230AC/4X21/EX

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Relay Module

Pre-assembled relay module consisting of: relay socket, function insertable module, relay with power contact and clamping flange approved according to ATEX/IECEx (zone 2) and Ex zone class I, div. 2, Push-in connection, 4 inverter contacts, Varistor, Input voltage: 230 VAC

Pre-assembled relay module consisting of: relay socket, function insertable module, relay with power contact and clamping flange approved according to ATEX/IECEx (zone 2) and Ex zone class I, div. 2, Push-in connection, 4 inverter contacts, Varistor, Input voltage: 230 V AC

3 View Availability View Price

2909740

RIF-2-RPT-LV-120AC/4X21/EX

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Relay Module

Pre-assembled relay module consisting of: relay socket, function insertable module, relay with power contact and clamping flange approved according to ATEX/IECEx (zone 2) and Ex zone class I, div. 2, Push-in connection, 4 inverter contacts, Varistor, Input voltage: 120 VAC

Pre-assembled relay module consisting of: relay base, function plug-in module, power contact relay, and retaining bracket, approval in accordance with ATEX/IECEx (Zone 2) and Ex Zone Class I, Div. 2, Push-in connection, 4 changeover contacts, Varistor, Input voltage: 120 V AC

3 View Availability View Price

2909744

REL-IR4/120AC/4X21/EX

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Single relay

Plug-in industrial relay, RT III sealed with power contacts, 4 switched contacts, mechanical switching position indicator, polarity: no polarity, input voltage: 120 V AC in combination with RIF-2.../EX sockets approved according to ATEX/IECEx (zone 2) and Ex zone class I, div. 2.

3 View Availability View Price

2944407

EMG 22-REL/KSR-G 24/TRN24/SO62

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Relay Module

Relay module, with switching mini-relay, with integrated NPN transistor activation, for low control currents, contact (AgNi 90/10): medium to large powers, 2 open contacts, nominal control voltage 24 V DC

Relay module, with miniature relay, with integrated transistor control NPN, for low control currents, contact (AgNi 90/10): medium to large powers, 2 closing contacts, nominal control voltage 24 V DC

3 View Availability View Price

2282091

FLKM-4I/O

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Interface module, with plug-in socket for 4 solid-state relays, with security latch, with screw connection, with light indicator and fuse, control logic: minus switching

Interface module, with plug-in socket for 4 solid-state relays, with fixing hook, with screw connection, with light and fuse indication, with negative connection control logic

Interface module, with plug-in socket for 4 solid-state relays, with security latch, with screw connection, with light indicator and fuse, control logic: minus switching

3 View Availability View Price

2301888

EMG 90-REL/MR-G220/6X 1/SO115

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Customer-specific relay module, 6 N/O contacts, 220 V DC input voltage

customer-specific relay module, 6 NO contacts, input voltage 220 V DC

Customer-specific relay module, 6 N/O contacts, 220 V DC input voltage

3 View Availability View Price

2904475

REL-MR-12DC/1IC

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Plug-in miniature power relay, with power contact for high switch-on currents, 1 N/O contact, input voltage 12 V DC

Plug-in miniature power relay, with power contact for high shut-off currents, 1 shut-off contact, input voltage 12VDC

Plug-in miniature power relay, with power contact for high switch-on currents, 1 N/O contact, input voltage 12 V DC

3 View Availability View Price

2909055

REL-PR3-220DC/3X21

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Plug-in high-power relay with power contacts, 3 changeover contacts, coil voltage: 220 V DC

Pluggable high-power relays with power contacts, 3 switches, coil voltage: 220 V DC

Plug-in high-power relay with power contacts, 3 changeover contacts, coil voltage: 220 V DC

3 View Availability View Price

2909056

REL-PR3-125DC/3X21

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Plug-in high-power relay with power contacts, 3 changeover contacts, coil voltage: 125 V DC

Pluggable high-power relays with power contacts, 3 switches, coil voltage: 125 V DC

Plug-in high-power relay with power contacts, 3 changeover contacts, coil voltage: 125 V DC

3 View Availability View Price

2909207

REL-OR3/LDP-125DC/3X21

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Plug-in octal relays with power contacts, 3 changeover contacts, test button, freewheeling diode, mechanical switch position indicator, polarity A1+, A2-, input voltage: 125 V DC

Plug-in octal relays with power contacts, 3 switches, test key, free-flowing diode, mechanical switching position indication, polarity A1+, A2-, input voltage: 125 V DC

Plug-in octal relays with power contacts, 3 changeover contacts, test button, freewheeling diode, mechanical switch position indicator, polarity A1+, A2-, input voltage: 125 V DC

3 View Availability View Price

2909211

REL-OR3/LDP-12DC/3X21

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Plug-in octal relays with power contacts, 3 changeover contacts, test button, freewheeling diode, mechanical switch position indicator, polarity A1+, A2-, input voltage: 12 V DC

Plug-in octal relays with power contacts, 3 switches, test key, free-flowing diode, mechanical switching position indication, polarity A1+, A2-, input voltage: 12 V DC

Plug-in octal relays with power contacts, 3 changeover contacts, test button, freewheeling diode, mechanical switch position indicator, polarity A1+, A2-, input voltage: 12 V DC

3 View Availability View Price

2910140

PLC-TR-1T-MUL-300M

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Ultra-narrow multi-function time relay with 4 functions, adjustable time range (0.1 s - 300 min), 1 PDT, screw connection

Particularly narrowly designed multifunction timing relay with 4 functions and a configurable time interval (0.1 s to 300 min), 1 inverter, screw connection

Ultra-narrow multi-function time relay with 4 functions, adjustable time range (0.1 s - 300 min), 1 PDT, screw connection

3 View Availability View Price

2910141

PLC-TR-1T-MUL-300M-PT

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Ultra-narrow multi-function time relay with 4 functions, adjustable time range (0.1 s - 300 min), 1 PDT, push-in connection

Particularly narrowly designed multifunction timing relay with 4 functions, configurable time interval (0.1 s to 300 min), 1 inverter, push-in connection

Ultra-narrow multi-function time relay with 4 functions, adjustable time range (0.1 s - 300 min), 1 PDT, push-in connection

3 View Availability View Price

2987338

REL-MR-24DC/ 1ICT

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Pluggable miniature power relay, with tungsten pre-contact for high switch-on currents up to 800 A peaks, 1 N/O contact, input voltage: 24 V DC

Pluggable miniature power relay, with tungsten advance contact for high input currents up to 800 A Peak, 1 normally open contact, input voltage 24 V DC

Pluggable miniature power relay, with tungsten pre-contact for high switch-on currents up to 800 A peaks, 1 N/O contact, input voltage: 24 V DC

3 View Availability View Price

5521856

FLKM I/O-G4

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Optocoupler module

Optocoupler Module

Optocoupler module

3 View Availability View Price

1049232

RIF-1-RPT-LV-24AC/2X21MS

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Relay Module

Pre-assembled relay module with push-in connection, consisting of: relay socket, relay with power contact, plug-in indication/antiparasitic module and clamping flange. Contact type: 2 investor contacts. Input voltage: 24 V AC

Pre-assembled relay module with push-in connection, consisting of: relay socket, relay with power contact, plug-in indication/antiparasitic module and clamping flange. Type of contact switching: 2 switches. Input voltage: 24 V AC

3 View Availability View Price

2910502

PLC-RSC-24DC/21-21/MS

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Relay Module

PLC-INTERFACE, composed of socket relay and relay with plug-in power contact with manual activation, integrated status LED and free-flowing diode, Screw connection, 2 switched contacts, Free-flowing diode, Input voltage: 24 VDC

3 View Availability View Price

2910506

PLC-RSC-230UC/21-21/MS

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Relay Module

PLC-INTERFACE, consisting of socket relay and relay with plug-in power contact with manual activation, integrated status LED, screw connection, 2 switched contacts, Rectifier bridge, Input voltage: 230 VAC / 220 VDC

3 View Availability View Price

2910507

PLC-RSC-24DC/21-21AU/MS

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Relay Module

PLC-INTERFACE, consisting of socket relay and plug-in multi-layer gold contact relay with manual operation, integrated status LED and free circulation diode, Screw connection, 2 switched contacts, Free circulation diode, Input voltage: 24 VDC

3 View Availability View Price

2910513

PLC-RSC-230UC/21-21AU/MS

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Relay Module

PLC-INTERFACE, consisting of socket relay and plug-in multi-layer gold contact relay with manual operation, integrated status LED, screw connection, 2 switched contacts, Rectifier bridge, Input voltage: 230 VAC / 220 VDC

3 View Availability View Price

2910514

PLC-RSC-24DC/21HC/MS

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Relay Module

PLC-INTERFACE, composed of socket relay and relay with plug-in power contact with manual activation, integrated status LED and free circulation diode, Screw connection, 1 switch, Diode against inv. Polarity, Free-flowing diode, Input voltage: 24 VDC

3 View Availability View Price

2910515

PLC-RSC-24UC/21HC/MS

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Relay Module

PLC-INTERFACE, consisting of socket relay and relay with plug-in power contact with manual activation, integrated status LED, Screw connection, 1 switch, Rectifier bridge, Input voltage: 24 V AC/DC

3 View Availability View Price

2910519

PLC-RPT-24DC/21-21/MS

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Relay Module

PLC-INTERFACE, composed of socket relay and relay with plug-in power contact with manual activation, integrated status LED and free circulation diode, Push-in connection, 2 switched contacts, Free circulation diode, Input voltage: 24 VDC

3 View Availability View Price

2910520

PLC-RPT-24UC/21-21/MS

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Relay Module

PLC-INTERFACE, consisting of socket relay and relay with plug-in power contact with manual activation, integrated status LED, push-in connection, 2 switched contacts, Rectifier bridge, Input voltage: 24 V AC/DC

PLC-INTERFACE, consisting of a relay base and pluggable power contact relay with manual operation, integrated status LED, Push-in connection, 2 changeover contacts, Bridge rectifier, Input voltage: 24 V AC/DC

3 View Availability View Price

2910521

PLC-RPT-48DC/21-21/MS

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Relay Module

PLC-INTERFACE, composed of socket relay and relay with plug-in power contact with manual activation, integrated status LED and free circulation diode, Push-in connection, 2 switched contacts, Rectifier bridge, Input voltage: 48 VDC

3 View Availability View Price

2910522

PLC-RPT-120UC/21-21/MS

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Relay Module

PLC-INTERFACE, consisting of socket relay and relay with plug-in power contact with manual activation, integrated status LED, push-in connection, 2 switched contacts, Rectifier bridge, Input voltage: 120 VAC / 110 VDC

PLC-INTERFACE, consisting of a relay base and pluggable power contact relay with manual operation, integrated status LED, Push-in connection, 2 changeover contacts, Bridge rectifier, Input voltage: 120 V AC / 110 V DC

3 View Availability View Price

2910523

PLC-RPT-230UC/21-21/MS

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Relay Module

PLC-INTERFACE, composed of socket relay and relay with plug-in power contact with manual activation, integrated status LED, push-in connection, 2 switched contacts, Rectifier bridge, Input voltage: 230 VAC / 220 VDC

PLC-INTERFACE, composed of socket relay and relay with plug-in power contact with manual activation, integrated status LED, push-in connection, 2 switched contacts, Rectifier bridge, Input voltage: 230 V AC / 220 V DC

3 View Availability View Price

2910524

PLC-RPT-24DC/21-21AU/MS

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Relay Module

PLC-INTERFACE, consisting of plug-in socket relay and multi-layer gold contact relay with manual operation, integrated status LED and free-flowing diode, Push-in connection, 2 switched contacts, Free-flowing diode, Input voltage: 24 VDC

3 View Availability View Price

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