KRDB420 [Littelfuse]

The KRDB Series is a compact time delay relay for OEM applications requiring small size, isolation, reliability, and long life. It features a microcontroller timing circuit for excellent repeat accuracy and stability. The relay is encapsulated to protect against shock, vibration, and humidity. It offers Delay-on-Break operation, with input voltage applied before and during timing. The output relay energizes upon closure of the initiate switch, and the time delay begins when the initiate switch is opened. The output remains energized during timing and de-energizes at the end of the delay. Reset is achieved by reclosing the initiate switch during timing or by loss of input voltage. The series includes models with fixed or adjustable time delays (0.1s to 1000s or 0.1s to 100m) and various input voltages (12VDC, 24VAC/DC, 120VAC, etc.). Accessories include panel mountable potentiometer for remote adjustment, mounting bracket, and knobs.