859-303 WAGO Signal Relays

Wago 859-303 is a fixed-type relay module featuring CAGE-CLAMP spring connections for secure and maintenance-free wiring. It is designed to handle a rated current of 5A continuously and can manage up to 20A AC inrush maximum current for 20ms. The module is equipped with a red LED for status indication and operates based on an electromechanical design. It recommends a minimum switching load of 20V / 10mA / 24V / 1mA. The relay provides a 1C/O / SPDT (Single Pole Double Throw) contact configuration. It is suitable for use within an ambient air temperature range for operation from -40°C to +50°C and for storage from -40°C to +70°C. The control voltage range is specified as 10.2-14.4Vdc (12Vdc nominal), with a rated impulse voltage (Uimp) of 0.85...1.2 x Uc. The module's dimensions are H91mm x W6mm x D56mm, fitting a 6mm width on a DIN-35 rail for installation. It features Silver-Tin (AgSnO) contacts for the switching mechanism, with a rated insulation voltage (Ui) of 4 kV and a maximum switching voltage of 250Vac. The control voltage for AC operations is designed for single-pole applications. The power consumption is optimized for DIN-35 rail mounting. The relay's switching speed is characterized by a 15ms closing and a 25ms opening time. It supports a rated operating voltage (Ue) of 250 V and is capable of 50,000 operations for Normally Closed (NC) circuits, with a mechanical endurance of up to 5,000,000 operations. The relay operates effectively within a relative humidity range of 5-95% without condensation.