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Precision Instruments for Transformer Temperature Monitoring

Dial-Type

Bellows-based OTI/WTI measure transformer oil and winding temperature using a sensing bulb and bellows-driven dial. Hybrid models feature embedded PT100 sensors for remote monitoring and SCADA integration.

TC2025

TC2025 Series

Temperature Range - 0 to 150°C
Accuracy - ±1% FSD
Angular sweep - 270°
No. of Switches - Std 4 & max 6 switches
Contact rating - 5A @ 250V AC or 0.5 A @ 220V DC
Switch range - 15% to 85% of FSD
Switch differential - S1 & S2: 3°C to 9°C (6 ±3°C) S3 to S6: 8°C to 40°C Adjustable
Capillary length - 3 to 25 meters

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TC27 SERIES

TC27 series

Temperature Range - 0 to 150°C
Accuracy - ±1.5% full scale division (FSD)
Angular sweep - 60°
No. of Switches - 4 (Trip, Alarm, Fan1 & Fan2)
Contact rating - 5A @ 250V AC/DC, 15A @ 250V AC, 0.5A @ 250V DC
Capillary length - Up to 25 meters
Switches can be adjustable individually

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TC26 SERIES

TC26

Temperature Range - 0 to 150°C
Accuracy - ±1.5% full scale division (FSD)
Angular sweep - 270°
No. of Switches - 2 (Trip & Alarm)
Contact rating - 5A @ 250V AC or 0.5 A @ 220V DC
Capillary length - Up to 20 meters
Switch testing knob available

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TC21 SERIES

TC21

Temperature Range - 0 to 150°C
Accuracy - ±1.5% full scale division (FSD)
Angular sweep - 60°
No. of Switches - 2 (Trip & Alarm)
Contact rating - 5A @ 250V AC or 0.5 A @ 220V DC
Capillary length - Up to 20 meters & stem type
Switch testing knob available

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TC21H

TC21H

Temperature Range - 0 to 150°C
Accuracy - ±1.5% full scale division (FSD)
Angular sweep - 60°
No. of Switches - 2 (Trip & Alarm)
Contact rating - 5A @ 250V AC or 0.5 A @ 220V DC
Capillary length - Up to 20 meters
This model comes with a CCU and (Optional - remote indicator)
Switch testing knob available

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m box

MARSHALLING BOX

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rtcc

RTCC PANELS