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WTRD1 Winding Protection relay

Introduction:
It is a Winding Protection relay based on thermistor (PTC) . It offers protections against Over heating of the windings of pumps, motors, transformers, alternators etc. & sense the temperature with the help of PTC thermistor. It can be used with single or triple PTC & also with 6 or 9 PTCs as a special case. It can used for AC/DC motor, generator, transformer, winding protection against over heating of SCRs & Bus Bars.
Features:
· Monitors Overload & Phase Loss, Phase Sequence by sensing Overheating of Windings.
· Operates with Embedded PTC sensors in the motor / transformer windings.
· Suitable for any PTC Thermistor.
· Sensor Short / Open Condition Monitoring.
· 1 CO output rated 230V AC / 5A (Resistive)
· Auto (Optional Manual) Reset.
· DIN Rail mounted Enclosure.
Application Areas:
Injection Molding machines Machine tools Crane & hoist motors Compressors & fan motors
Technical Specifications:
Sr.
Parameter
Specifications
1 Supply Voltage Auxiliary 48 / 110 / 220-240 24 V DC ±10%
2 Output Contacts 1 CO
3 Trip Setting Thermistor Sensor Healthy 40 ohm - 4 K ohm; Thermistor Sensor Trip 4.1 K ohm - 5.5 K ohm; Thermistor Sensor Open 5.6 K ohm & above; Reset 1.5 K ohm - 1.8 K ohm for 1/3 PTC 2.2 K ohm - 2.8 K ohm for 6/9 PTC
4 Trip time delay Less than 2 secs.
5 Resetting Mode Auto / Manual (optional)
6 Dimensions (mm) Overall (L x W x D) 76 x 30.5 x 117.5; Mounting (L x W) 68 mm centre to centre
7 Weight 300 gms.

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