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Voltage protection relay S91
currentphasetemperature

voltage protection relay
voltage protection relay
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Characteristics

Measured/monitored value
voltage, current, phase, temperature, safety, power factor
Contact configuration
SPDT
Network
three-phase, AC, single-phase
Applications
for three-phase motor pump, for electric motors
Mounting
DIN rail
Other characteristics
programmable, adjustable, multifunction, compact, with fault indication
Tripping current

Min.: 0 A

Max.: 16 A

Trigger voltage

Min.: 220 V

Max.: 415 V

Description

Multi-protection relays for motors 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. 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.

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