Product Overview
The 400A Neutral Terminal Block is an industrial-grade connection device designed for high-current neutral distribution in low-voltage switchgear, main distribution boards, and industrial power systems. Accepting conductors from 25mm² to 70mm², it provides a robust, reliable neutral connection point that meets the demanding requirements of commercial and industrial electrical installations.
Industrial-Grade Electrical Specifications
| Parameter | Specification |
| Rated Current (Ie) | 400A |
| Rated Insulation Voltage (Ui) | 690V / 1000V AC |
| Rated Impulse Withstand (Uimp) | 8kV |
| Temperature Rise | ≤ 50K at 400A rated current (per IEC 60947-7-1) |
| Contact Resistance | ≤ 0.2 mΩ |
| Short-Time Withstand (Icw) | 4kA / 1s |
| Withstand Voltage Test | AC 2500V / 1min, no breakdown |
| Insulation Resistance | ≥ 500 MΩ at 500V DC |
Connection Type & Cable Compatibility
| Attribute | Specification |
| Connection Method | Screw-clamp type (barrier-style) with pressure plate |
| Main Conductor Range | 25–70 mm² (Cu) |
| Branch Conductor Range | 16–50 mm² (Cu) |
| Clamping Screw (Main) | M8, hex socket |
| Clamping Screw (Branch) | M6, hex socket |
| Recommended Torque (Main) | 10–14 N·m |
| Recommended Torque (Branch) | 5–7 N·m |
| Conductor Type | Solid, stranded, or finely stranded (with ferrule) copper conductors |
The pressure-plate design distributes clamping force evenly across the conductor cross-section, preventing strand damage and ensuring consistent contact pressure even with finely stranded (Class 5/6) conductors.
Applications
Main distribution boards (MDB) in commercial buildings, industrial switchgear assemblies, generator neutral connections, data center power distribution, solar inverter AC combiner boxes, and any industrial installation requiring a 400A-class neutral connection point for 25–70mm² conductors.
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