Rising voltage trigger 230V AC for MPX3 417412

Protection against voltage rise in motor circuits

This module is a dedicated control element that allows for remote or automatic disconnection of the MPX3 series motor circuit breaker in the event of exceeding a safe voltage level. Its primary function is to protect the installation and connected loads from the consequences of stoppages or failures resulting from excessive voltage rise in the network. Unlike standard thermal protections that react to current, this device directly monitors network parameters, which is crucial in systems where voltage fluctuations can damage coils or control electronics.

The device operates within a control voltage range of AC 50/60 Hz, accepting values from 195.5 V to 253 V. Such a wide operating range ensures that the module does not trip during typical, short-term network fluctuations (e.g., during the startup of large loads) but reacts effectively in the event of a sustained voltage rise above permissible norms. This protects against motor insulation damage and prevents uncontrolled device startup after power returns to normal.

Installation and connection method

Installation requires a direct connection to the circuit breaker coil or its drive mechanism. The module uses a classic screw connection, ensuring contact durability and minimizing the risk of wire loosening due to vibrations characteristic of industrial switchgear cabinets. This is not a "plug-and-play" device requiring special adapters – installation is performed by screwing control wires into dedicated terminals.

It is worth noting that this trigger:

• Does not have its own auxiliary contacts (the number of normally open, changeover, and normally closed contacts is 0) – its function is limited solely to generating a trip pulse for the main circuit breaker.
• Is intended exclusively for MPX3 series motor circuit breakers and cannot be used as a standalone element in lighting circuits or as an addition to standard overcurrent circuit breakers or overload relays of other types.
• Does not require external cam switches for its operation.

Key electrical data for correct control circuit configuration are alternating current (AC) at a frequency of 50 or 60 Hz and an operating voltage range within 195.5 ... 253 V. These parameters guarantee stable device operation in a standard power network without the need for additional transformers or stabilizers on the control input.

Practical application in industrial installations

In building automation systems or production lines, a situation where network voltage rises above the nominal 230 V (e.g., to 240-250 V) can lead to motor winding overheating or inverter malfunctions. This trigger acts as a "safety sensor" that immediately opens the main circuit upon detecting such a state. This avoids costly equipment repairs and production downtime.

For the installer, this means the ability to create a simple but effective protection system without the need for complex overvoltage relays with their own power supply – the module draws energy directly from the monitored control line. For the end user, this is a guarantee of safe operation of drive devices even under conditions of an unstable power network. The device does not require additional calibration – the reaction range is factory-set and adapted to European standards for 230 V AC networks.