Immersion heater

Overview
The Rotkappe® range of fire-resistant sheathed immersion heaters are heating devices designed to reduce the risk of thermal degradation of installations and tanks in case of partial or total dry running. They incorporate an integrated overheat protection system that interrupts heating automatically when the immersion tube reaches a critical temperature. These units are intended for industrial process applications where thermal safety and controlled restart are required.

Technical Specifications

• Integrated overheat protection reacting to excessive immersion tube temperature
• Automatic cut-off on overheating; manual reset required after trip
• Available in single-phase, bi-phase and three-phase versions
• Three-phase models: up to 10 kW with additional relay
• Designed for vertical mounting in tanks and vessels

Key Benefits

• Reduces the risk of thermal damage and fire in case of dry running
• Provides intrinsic heater-level protection for critical processes
• Manual reset ensures controlled inspection before restart
• Configurable for different electrical supplies and installation layouts
• Compatible with most industrial process fluids depending on sheath material

Main Applications

• Wall-mounted heating for industrial tanks and vessels
• Heating of chemical baths and process tanks requiring controlled temperatures
• Installations with risk of liquid evaporation, leakage or intermittent level
• Processes where thermal safety and fail-safe behaviour are required

Safety and Compliance

• Compliant with EN 60519-1/2
• Protection class: Class 1

Options & Accessories (examples shown)

• Assembly key SB for BC head (universal key)
• Differential current controller DSW3/2 (required for three-phase units with ABS system)
• BC terminal box (head options: red PP head; white PVDF head)
• HM mounting sleeve for BC head — EPDM, bore Ø 70–76 mm
• EM mounting sleeve for BC head — EPDM, bore Ø 87–90 mm
• THB support for ABS head

Installation & Maintenance

• Install the heater vertically and secure the mounting sleeve to ensure correct immersion depth
• Verify electrical connections and select appropriate relay for three-phase models
• After a trip, perform inspection before manual reset to confirm safe conditions
• Periodically check sheath condition and seals according to fluid compatibility

FAQ

• How does the overheat protection work? — It detects excessive temperature at the immersion tube and cuts power automatically.
• Do these heaters replace other safety devices? — No; additional protective devices may be required according to site standards.
• Can they be used with any liquid? — Compatibility depends on sheath material; select material according to the process fluid.
• What is required after a trip? — Manual reset is required and an inspection is recommended before restart.

Technical Data (summary)

• Supply: single-phase, bi-phase, three-phase
• Power: up to 10 kW (three-phase with relay)
• Protection: integrated overheat system, manual reset
• Standards: EN 60519-1/2; Protection class 1