Schneider Electric LV429407 – ComPacT NSX Shunt Trip (MX) for Remote Tripping at 100–130 V AC

The Schneider Electric LV429407 is the MX shunt trip accessory for ComPacT NSX molded-case circuit breakers, typically used on NSX100, NSX160, and NSX250 frames. It lets you remotely open (trip) the breaker by energizing a coil at 100–130 V AC, which is exactly what you want for emergency-off circuits, PLC-driven protection sequences, or upstream interlocking. One thing I appreciate is how it integrates inside the breaker without changing the panel footprint—clean, reliable, and easy to standardize across panels.

Company’s Order Placement Process and Guarantees

Key Features

• Remote trip at 100–130 V AC – Energize the MX coil to open the breaker from a pushbutton, relay, or PLC output.
• Native fit for ComPacT NSX – Designed for NSX100/160/250 frames, so no extra brackets or footprint growth.
• Fast, decisive operation – Provides instantaneous tripping; ideal for E-stop chains or upstream fault shedding.
• Panel-friendly wiring – Simple two-wire coil connection; easy to integrate in standard control circuits.
• Inside-the-breaker mounting – Protected installation reduces mechanical damage and keeps wiring tidy.
• Standards-compliant design – Built for IEC/EN 60947-2 environments; commonly accepted in OEM and panel-building workflows.

Technical Specifications

Application Fields

You’ll see the LV429407 in industrial switchboards, OEM machinery panels, data centers, utilities, and process plants where a remote trip is required—typically for emergency stop systems, upstream load shedding, generator transfer schemes, or interlocking between feeders. From my experience, it’s also a neat fit when you want the PLC to enforce a safe state after a fault without sending a tech to the cabinet.

Advantages & Value

• Reliability – Schneider’s NSX ecosystem is well-proven; the MX coil response is crisp and consistent.
• Compatibility – Native accessory minimizes integration risk and installation time.
• Cost control – Remote trip avoids oversizing control gear; you don’t need external contactors just to force an open state.
• Serviceability – Clear wiring and internal mounting simplify maintenance; spare parts are easy to source globally.
• Support – Documentation and wiring guidance are straightforward, which helps during FAT and site commissioning.

Installation & Maintenance

• Panel requirements – Mount in a ventilated enclosure that meets your breaker’s derating rules; keep ambient within the stated range.
• Wiring – Use correctly rated control wires; a clean two-wire run from the trip command (pushbutton/relay/PLC). You might notice better results with shielded control wiring in noisy environments.
• Torque and terminations – Tighten coil terminals to Schneider’s recommended torque (typically around 0.8 N·m; check the latest datasheet).
• Control signal – Provide a stable AC source at 100–130 V. In many cases, a brief pulse is sufficient; some users maintain the signal until the trip is confirmed.
• Safety – De-energize and lock out the circuit before fitting or replacing the accessory. Verify trip function during commissioning.
• Routine checks – Periodically test the remote trip, inspect wiring tightness, and keep the switchboard free from dust. Firmware updates don’t apply to this passive accessory.

Quality & Certifications

• Conforms with IEC/EN 60947-2 accessory requirements
• CE marking and RoHS compliance
• UL coordination with ComPacT NSX breaker ranges (model-dependent)
• Manufacturer’s warranty: 12 months (365 days)

Related Accessories (for a complete NSX control set)

Many panels pair the LV429407 with an undervoltage release (MN) for fail-safe drop-out on power loss, OF/SD auxiliary contacts for remote status, or a motor mechanism for electrical ON/OFF. If you share the exact NSX frame and trip unit, I can match the correct accessory codes so everything snaps in first time.