Universal relay 1 x 4UM / Viessmann 5551 / track H0 Product information "Universal relay 1 x 4UM" Bistable relay with 4 switches that switch simultaneously. The relay converts electricity pulses, such as those supplied by digital magnetic art decoders, keyboard steeplets, switching tracks and track contacts. For electrical control of lighting, signals, etc. as well as for block controls. Switching through the end of the final system with impulse or permanent current. Real feedback is in conjunction with the universal buttons. 5549 possible. With manual operating lever. Current consumption: 400mA. .