WAGO 859-304 Relay Module SPDT 24VDC

Technical Overview

Compact 6mm DIN rail relay module with 24VDC coil, SPDT 5A/250VAC contact, and CAGE CLAMP® terminals.

Key Features

SPDT (Single-Pole Double-Throw) contact rated for 5 A.
24 VDC coil with 10 mA current draw.
Red LED status indicator for operational feedback.
Slim 6 mm module width for space-saving DIN rail installations.
Tool-free spring terminal wiring using CAGE CLAMP® technology.
Rated voltage of 300 V for robust electrical systems.
IP20 protection type (in connected state or with end plate).
Wide ambient operating temperature range of -40 to +50 °C.
Contacts made of Silver Tin Oxide (AgSnO).
Mechanical life of 5 x 10^6 switching operations.
Switching voltage up to 250 VAC.

Technical Specification Matrix

Parameter	Value
Nominal Input Voltage	24 VDC
Rated Voltage	300 V
Rated Impulse Withstand Voltage	4 kV
Overvoltage Category	III
Protection Type	IP20
Contact Configuration	SPDT (1 Changeover Contact)
Contact Current	5 A (continuous)
Switching Voltage AC	250 V AC
Connectable Conductor (Solid/Fine-Stranded)	0.08 … 2.5 mm² / 28 … 14 AWG
Connectable Conductor (Fine-Stranded w/ Insulated Ferrule)	0.08 … 1.5 mm² / 28 … 16 AWG
Strip Length	5 … 6 mm
Ambient Temperature (Operation)	-40 … +50 °C
Ambient Temperature (Storage)	-40 … +70 °C
Relative Humidity	5 … 95 % (no condensation permissible)
Operating Altitude (max.)	2000 m
Coil Current Draw	10 mA
Mounting Type	DIN-35 Rail
Terminal Type	Spring Terminal (CAGE CLAMP®)
Contact Material	Silver Tin Oxide (AgSnO)
Mechanical Life	5 x 10^6 switching operations
Pull-In Time	5 ms
Drop-Out Time	6 ms
Switching Power AC	1250 VA
Physical Weight (kg)	0.02
Dimensions L x W x H (cm)	9.1 x 0.6 x 5.6

Industrial Applications

1. Industrial Automation Control Panel Signal Isolation

The WAGO 859-304 relay module is ideal for isolating control signals from sensitive electronics in industrial automation control panels. Its 24 VDC nominal input voltage reliably interfaces with PLCs, while the SPDT contact switches up to 250 VAC at 5 A, providing effective signal isolation and power amplification for different voltage levels. Its compact 6mm width optimizes space in crowded cabinets.

Problem Solved

Protects sensitive PLC outputs from inductive loads or higher voltages in industrial settings, allowing low-power control signals to switch higher-power loads while saving critical space in control cabinets.

Signal IsolationPLC InterfaceLoad SwitchingVoltage ConversionDIN Rail MountingCompact Design

2. Motor Starter Circuit Interface

This relay module serves as a reliable interface between low-voltage control circuits (e.g., 24 VDC from emergency stop buttons or control switches) and the coils of larger motor starters or contactors. The 5A contact rating is sufficient for energizing most standard contactor coils, ensuring dependable operation in motor control centers.

Problem Solved

Enables safe and dependable control of motor starters from low-voltage safety or control circuits, providing essential electrical separation and facilitating localized control without the need for long runs of high-current wiring.

Motor ControlContactor CoilLow-Voltage ControlPower InterfaceSafety CircuitElectrical Separation

3. Building Automation HVAC System Control

In building automation systems, particularly for HVAC control, the 859-304 effectively switches auxiliary loads such as small fans, damper actuators, or indicator lights. Its 24 VDC coil is compatible with standard building control voltages, and the 5A/250VAC contact is well-suited for various loads within air handling units or zone control panels. The broad operating temperature range of -40 to +50 °C ensures robust performance across diverse environmental conditions.

Problem Solved

Provides reliable switching for auxiliary HVAC components, allowing seamless integration with central building management systems while ensuring robust operation in varying environmental conditions, all within a space-efficient form factor.

HVAC ControlBuilding AutomationAuxiliary Load SwitchingEnvironmental ResilienceSpace SavingZone Control