Installation relay with manual operation, the installation relay is suitable for switching 1-phase or 3-phase consumers up to 20A, the universal application possibilities in building technology and house installations mean that the following applications and controls can be implemented: switching lighting systems and electric heaters, switching ventilation and air conditioning systems, fans, switching heat pumps, switching electrically controlled roller doors and blinds, switching incandescent lamps and gas discharge lamps, the ZR./ series of installation relays meets the requirements of EN/IEC 60947 and EN/IEC 1095, manual operation for testing purposes, switching contacts with safe separation AC1 according to EN 60947-4-1 (ZR, Z-RK), option of a visual display of the operating status using an LED, front-side switch position display using a manual operation button, all terminals - coil and contacts - with clamping aid. No 'plugging in' of the connecting wires possible, main contacts can be connected with standard pin busbars, use of flame-retardant materials, as well as chlorine- and halogen-free plastics, touch safety in accordance with VBG4, advantages:, optionally 3 design variants (ZR, Z-RK, Z-RE), low switching noise and hum-free, easy connection thanks to generously dimensioned terminals supplied in the open state, simple snap-on fastening for the 35mm top hat rail, high flexibility thanks to various contact configurations, easy accessibility for connecting the coil supply