ABB S803N Miniature Circuit Breaker, 3-Pole, 20A, Type B, 690V ac AC, 36 kA Breaking Capacity

This miniature circuit breaker is a three-pole protective device designed to interrupt fault currents in low-voltage electrical installations. It operates across AC and DC systems up to 690 V and uses a combined thermal and electromechanical tripping arrangement to respond to overload and short-circuit conditions. The unit mounts on a DIN rail and provides a resettable I/O actuator with screw-type terminals for conductor connection.

• 36 kA breaking capacity gives strong short-circuit interruption capability
• Type B trip characteristic protects circuits with low inrush currents
• Thermal electromechanical tripping offers overload and instantaneous response
• IP20 and IP40 ratings permit protection in controlled enclosures
• Three-pole configuration enables simultaneous multi-phase disconnection

• Suitable for industrial DIN-rail distribution boards
• Ideal for motor control with low inrush requirements
• Can be used for AC and DC supply isolation up to 690 V
• Used with panel-mounted control gear requiring screw connections

It employs screw terminals for secure conductor clamping and straightforward wiring.

The breaker is designed for Rapid installation onto standard DIN rails for modular distribution assemblies.

The combined thermal element manages overloads while the electromechanical mechanism delivers an instantaneous trip on high fault currents.

The device is three-pole, allowing simultaneous interruption of all three phases in a system.