The JUMO ATH-20 is a surface-mounted thermostat designed for monitoring and controlling thermal processes. It operates on the fluid expansion principle, uses a microswitch for switching, and is available as a temperature controller (TR), monitor (TW), limiter (TB), or safety temperature limiter (STB).

General Information

• Manufacturer: JUMO GmbH & Co. KG
• Series: ATH (Surface-mounted thermostats)
• Model: ATH-20
• Protection Class: IP54 (sturdy housing for industrial environments)
• Compliance: DIN EN 14597 and Pressure Equipment Directive 2014/68/EU

Operating Principle

• Works on the fluid expansion principle: temperature changes expand fluid in the sensing system, actuating a microswitch.
• Microswitch: Single-pole snap-action switch for reliable electrical control.
• Safety Function: In case of fluid leakage or pressure drop, the system automatically switches to a safe state.