Intermediate relays for automation | for PLC and electrical control panels

Technical specifications

Contact types: 1CO (SPDT), 2CO (DPDT), 4CO (4PDT)
Control voltage:
12V DC
24V DC / AC
110V AC
230V AC
Switching current: typically 5A – 16A
Mounting:
DIN rail (with socket)
PCB / socket mounting
Indication: LED (depending on model)
Additional features: mechanical test button, replaceable module with socket
Operating temperature: -25°C to +55°C (depending on model)

Functions

Signal amplification – allows weak PLC signals to control more powerful devices
Circuit isolation – protects control electronics
Contact multiplication – one signal can control multiple circuits
PLC protection – reduces load on outputs
Universal application – suitable for various automation circuits
Easy replacement – relays can be replaced without disassembling the entire system

How to choose the right relay?

By control voltage

PLC systems → 24V DC
Industry / contactors → 230V AC
Special solutions → 12V or 110V

By number of contacts

1CO (SPDT) → for simple control
2CO (DPDT) → for two circuits
4CO (4PDT) → for more complex systems

By load

For signals → 5A relays
For devices → 10A–16A relays

By mounting

DIN rail → for electrical panels
PCB / socket → for device integration

Applications

For home users: Lighting control via switches or timers, switching pumps, fans or heating devices, signal switching in smart home systems
In industry / for engineers: PLC signal expansion and load control, control of automated lines, control of motors, contactors, valves, signal isolation between different systems
For electricians: Assembly of electrical panels, implementation of control circuits, convenient solution between PLC and power devices, quick relay replacement during service
Automation / building management: BMS systems, alarm systems, security systems, time relays, sensor integration

Advantages

Universal application (from residential to industrial)
Separation of control and power circuits
Easy installation and replacement
Compatibility with various voltages
Reliable and long-lasting operation
Compact solution

Disadvantages

Mechanical wear (limited number of switching cycles)
May require an additional socket
Not always suitable for very high loads (contactor required)
May produce a slight clicking sound

Intermediate relays are an essential component in every electrical or automation system. They ensure flexible, safe and efficient control, allowing systems to be optimized and adapted to various needs – from simple residential solutions to complex industrial projects.