Line choke (inlet) 4%, 3-phase for power up to 5.5 kW INS 3-12-400

Limiting inrush currents and protecting the installation.

A network choke, also known as an input choke, is an element used to limit inrush currents when switching on three-phase receivers. INS 3-12-400 is designed to work with devices with a power of up to 5.5 kW. Its task is to reduce momentary current surges that can occur when starting induction motors or other receivers with high power consumption. This protects the electrical installation from overloads and damage, and also reduces interference in the power supply network.

Construction and application

The INS 3-12-400 choke is characterized by an impedance of 4%, which means that it limits the short-circuit current to 4% of the nominal value. This solution is particularly useful in the case of frequent starting and stopping of motors, where starting currents can many times exceed the nominal current. The choke design is based on winding coils on a ferromagnetic core, which ensures effective harmonic filtering and voltage stabilization in the network.

Key features and benefits

• Limiting inrush currents: Reduces the load on the electrical installation during device start-up, which translates to a longer lifespan of components.
• Protection against overloads: Protects the circuit from the effects of sudden current surges, minimizing the risk of failure and downtime.
• Interference reduction: Suppresses harmonics and stabilizes the voltage in the power supply network, improving the quality of electrical energy.
• Three-phase system: Designed for operation in three-phase electrical installations with a voltage of 400V.
• Rated power: Optimal choice for devices with a power of up to 5.5 kW – ideal for workshops, production halls or public buildings.
• Compact dimensions: Allow easy mounting inside control cabinets or electrical enclosures (dimensions: 125 x 116 x 70 mm).
• Wire cross-section: Possibility of connecting wires with a cross-section of up to 5x8 mm².
• Rated current: 12 A – provides adequate protection for typical receivers with a power of up to 5.5 kW.

The rated power is 5.5 kW with an impedance of 4% and a rated voltage of 400V. The rated current is 12A, and the dimensions of the choke are 125 x 116 x 70 mm. Possible wire cross-section is up to 5x8 mm².