MINIR4 compact relay controller Small and compact: The compact size allows installation in various mounting boxes, including the smallest European standard size. Relay Disconnect Mode: The MINIR4 features Relay Disconnect Mode, which means the states of external switches and relays are separated, so operation of the external switch knob does not affect the relay state. External Switch Control: Easy connection to momentary switches, door exit switches, SPDT switches, interlock switches, and even dry contact sensors. Safe and Reliable: TUV, CE and FCC certifications ensure a safer and more reliable product. Key benefits Decoupled control: External switch actions do not unintentionally change the relay state, reducing risk in critical applications. Flexible compatibility: Supports a range of switch types and sensors without reconfiguring wiring. Space efficient: Designed for installation in compact enclosures and the smallest European standard mounting boxes. Trusted safety and compliance: Certifications from TUV, CE and FCC provide assurance of safety and performance. Use scenarios Access control and door interlocks: Use with a door exit switch and interlock switch to control a lock or alarm, while keeping the relay state stable regardless of external switch handling. Compact industrial control: Pair SPDT and dry contact sensors in a small control panel to manage interlocks or safety circuits without affecting relay operation. Home or small office automation: Connect momentary switches to trigger actions (lighting, fans, or devices) in tight spaces, with reliable relay behavior unaffected by how the external switch is operated.