The TH104BUS V5.3 Thermal Protection Relay was developed to monitor and protect electrical equipment against excessive temperature rises. With four inputs for PT100 sensors, it allows simultaneous supervision of up to four thermal channels: S1, S2, S3, and Tamb (ambient temperature).

This equipment is ideal for applications in dry transformers, motors, generators, bearings, and industrial machines, offering high reliability and precision. The V5.3 model introduces improvements such as a more robust power supply with greater resistance to oscillations, as well as a faster and more efficient Modbus® RTU response.

The front panel features a digital display, indicator LEDs, and an operation keypad with audible beeps, providing easy navigation through the display (HOT, SCAN, MAN, Tmax) and programming functions. Among its main features are:

– Automatic detection of faults in PT100 probes (open or short circuit)
– Control of two fans (FAN1 and FAN2) with configurable hysteresis
– Alarm (ALARM), shutdown (TRIP), and fault (FAULT) relays
– Selection of the temperature source for activating FAN2 (All or Tamb mode)

Communication is via the RS485 port, compatible with the Modbus® RTU protocol, allowing integration with supervisory systems (PLCs, PCs) or connection to the internet via an Ethernet converter (optional), enabling remote monitoring.

In addition, the TH104BUS V5.3 offers continuous protection during parameter programming, ensures individual relay testing directly on the panel, and features protection against electromagnetic noise and overloads.

Technical Specifications (summary):
– Power supply: 24 to 240 Vac/Vdc (50/60Hz)
– Inputs: 4 PT100 sensors (3 wires), measurement range from 0 to 250°C
– Outputs: 5 relays (2 ALARM/TRIP, 2 FAN, 1 FAULT)
– Display: 18 mm, 3 digits + indicator LEDs
– Communication: RS485 – Modbus RTU up to 115,200 bps
– Dimensions: 96×96 mm (DIN standard), depth 105 mm

The TH104BUS V5.3 is supplied with an installation manual and mounting clips, and complies with international standards such as IEC 60076-11 and ABNT NBR 5356-11, making it a benchmark in thermal protection in the electrical sector.