The TB 45 temperature limiter is intended for precise, cost-effective signal monitoring and limiting tasks. Every TB 45 is fitted with at least one universal input and two output relays. Optionally, the TB 45 can be supplied with an analog output for display purposes. Galvanic isolation is provided between inputs and outputs as well as from the supply voltage and the communication interfaces.
The TB 45 is a compact temperature limiter and monitor designed for heating and refrigeration processes. It fits on a top‑hat DIN rail, measures thermocouple, resistive and current/voltage inputs, and offers two relay outputs plus optional analog and RS‑485 interfaces.
Key features include a dual‑line LCD display, three‑key front operation, BluePort® front interface, configurable engineering units, and extensive safety functions such as galvanic isolation and password protection. Technical data cover input resolution, output ranges, power consumption, environmental ratings and certification details.
| Device width | 22.5 mm |
|---|---|
| Relay contact rating | 500 VA, 250 VAC, 2 A at 48‑62 Hz |
| Power consumption (AC version) | ≈7 VA max. |
| Power consumption (24 V version) | ≈4 VA / 3 W max. |
| Input resolution | >14 bits |
| Analog current output range | 0‑4…20 mA |
| Operating temperature range | -20 °C … 60 °C |
| IP protection class | IP20 |
The TB 45 is only 22.5 mm wide.
It provides two relay outputs.
Yes, an optional RS‑485 interface with Modbus RTU protocol can be fitted.