Motor starter MS18-4A 004600347

Motor starter MS18-4A is a reliable protection for electric motors, designed for both professional and home applications. The device effectively protects circuits against overload and short circuit, ensuring safe and long-lasting operation of the installation.

Characteristics and application

The MS18-4A circuit breaker from the ASTI series by ETI Polam is a three-pole device designed to protect motors with a power of up to 1.5 kW (at 400V AC). Its thermal-magnetic tripping method guarantees a quick response to irregularities in the circuit. The application of this circuit breaker is wide – it is ideal for workshops, garages, light industry and home installations powering pumps, fans or other devices with a motor. Protection against phase failure further increases the safety of operation of the protected devices.

Construction and parameters

The construction of the circuit breaker is based on solid workmanship and permanent mounting. It has frame terminals, which facilitate the connection of wires. The rated continuous current (Iu) is 4A, and the setting range of the overload release is 2.5 - 4A, which allows for precise adjustment to the load characteristics. The rated short-circuit breaking capacity (Icu) at 400V AC is as much as 50 kA, which ensures effective protection even in the event of serious short circuits. The device operates in the voltage range from 230V to 690V AC. The degree of protection IP20 indicates protection against finger contact and against the ingress of solid objects larger than 12.5 mm.

• Tripping method: Thermal-magnetic – a combination of thermal and magnetic protection provides comprehensive protection.
• Thermal protection: Protects the motor against overheating caused by overload.
• Magnetic protection: Reacts instantly to a short circuit, disconnecting the circuit and preventing damage.
• Phase failure sensitivity: Detects the absence of one of the supply phases and disconnects the circuit, protecting the motor from damage caused by operation at incomplete voltage.
• Rated power: 1.5 kW at 400V AC and 0.8 kW at 230V AC – allows you to choose the right circuit breaker for a specific load.
• Three-pole construction: Provides full protection for three-phase electric motors.