Control unit S18A is designed for terminal box K18 and heater types IU611/IU611R. It features a time relay and contactor providing a 2-hour switch-on delay and half-power operation during power supply failure. If required, half the power output can be disconnected during overcharge via a current relay. Power steps are: 0 – ¼ – ½ – ¾ – 1.

• For terminal box K18
• Compatible with heater types IU611/IU611R
• Equipped with time relay and contactor
• 2-hour switch-on delay
• Automatic half-power mode at power failure
• Power step control: 0–¼–½–¾–1