Voltage protection relay S91

currentphasesafety

S91 is a protection device for electric motors. It allows the detection of incorrect phase sequence or phase failure, excess current consumption, no-load operation with power factor measurement. The device has an input for PTC (thermistor with negative temperature coefficient) to protect the motor from over-temperature and enable input for starting the motor. S91 operates in 3 operating modes: single-phase or three-phase measurement, maximum current range 5 or 16 A, operation with or without PTC. Available model for 230V power supply (S91), and model for 380V power supply (S91-400). Main applications: - Protection of single-phase or three-phase pumps for possible rotor blockage and overtemperature - Detection of breakage of mechanical transmission devices, e.g. belts or chains and to protect against blockage of the transmission system. Withstand voltage - 2.5 kV Pulse withstand voltage - 4 kV Current measurement - Direct up to 16 A or by Amperometric Transformer Voltage measurement - Maximum rated voltage 660 Vac Functions / Parameters managed - Temperature warnings Power factor Max current Min voltage Phase failure Front selector switch - operating modes for motor/temperature control Front adjustment trimmer - Self-restart time Inhibition Intervention Minimum power factor Maximum current Output type - 1 SPDT - 250 Vac relay Display - Alarm info, engine rotation, PTC sensor line Operating Temperature - -20..+65°C Housing - UL94 VO material, grey color. Terminals - Screw terminals pitch 7.5 mm; section < 2.5 mm2, length < 30m Dimension LxHxD - 53.5 x 73 x 90 mm Weight - 250 g Mounting - DIN rail bar 35mm IEC EN60715 Certificazioni - CE Norms - EN 61000-6-4, EN 61000-6-2, EN 61010-1