Overload protection for electrical measurement arrangement - using low-cost switch-off relay with manual reset, bistable relay, amplifier and delay circuits

摘要

The overload protection arrangement contains a switch-off relay (8) with manual reset, an activation circuit connected to an electrical measurement arrangement's measurement unit (1) via a delay circuit (6) and amolifier (7) and an off contact (9) in series with the measurement unit. The switching relay is a switch protector with additional working contact (10). The manual reset is coupled with a switch (17) which opens the off contact. A bistable relay (12) with an off contact parallel to the off and switch contacts is activated when the additional contact opens. USE/ADVANTAGE - Electrical measurement arrangement overload protection devices uses economical switch-off relay.