ESDR421A4 [Littelfuse]

The ESDR Series is a range of time delay relays designed for general purpose commercial and industrial applications. It features independent adjustment of both ON and OFF time periods, with options for fixed, onboard, or external adjustment. The series uses microcontroller-based technology for high accuracy, with factory calibration of ±5% and repeat accuracy of ±0.1%. It supports input voltages from 12VDC to 230VAC and time delays from 0.1 seconds to 1000 minutes. The output is solid-state, rated for 1A steady and 10A inrush current, and the modules are fully encapsulated for protection against shock, vibration, and humidity. Operation includes recycling modes with ON time first or OFF time first, and reset is achieved by removing input voltage. The design is compact and cost-effective, suitable for OEM applications.