Mitsubishi NF63-SV 3P 50A Circuit Breaker
New factory sealed WS-V Series Standard Class MCCB with 5A to 63A rating, 600V AC/DC operation, and 7.5kA breaking capacity at 400V.
Product Overview
The Mitsubishi NF63-SV is a Standard Class moulded case circuit breaker in the WS-V Series, designed for industrial distribution and machine control applications. This 3-pole, 50A unit offers reliable protection with fixed thermal-magnetic trip unit and front connection capability.
Key Specifications
| Product Family |
NF63-SV |
| Series |
WS-V Series - NF-S (Standard Class) MCCB |
| Rated Current Range |
5A to 63A |
| Rated Voltage |
600V AC / 250V DC |
| Poles Available |
2P, 3P, 4P |
| Breaking Capacity at 400V |
7.5 kA (IEC 60947) |
| Breaking Capacity at 200-230V |
15 kA (IEC 60947) |
| Trip Unit |
Fixed Thermal-Magnetic |
| Connection |
Front cable lugs or busbars |
| Standard |
IEC 60947-2 |
| Manufacturer |
Mitsubishi Electric |
Performance Class Comparison
The WS-V series offers three performance classes to match application requirements:
- NF-C (Economy Class): 5 kA at 400V - Cost-effective for installations with limited fault current
- NF-S (Standard Class - This Product): 7.5 kA at 400V - Ideal for most industrial distribution scenarios
- NF-H (High Performance Class): 10 kA at 400V - For installations near high-capacity transformers
Protection Features
Fixed thermal-magnetic trip unit provides comprehensive protection:
- Thermal Element: Overload protection with inverse time characteristic for motor starting currents
- Magnetic Element: Instantaneous short-circuit protection for fault current interruption
AC/DC Operation
Rated for both AC and DC service, making it suitable for conventional three-phase distribution, battery systems, DC bus protection in drive cabinets, solar installations, and UPS output protection.
Accessory Compatibility
Compatible with full WS-V series accessory range including terminal covers, auxiliary contacts, alarm contacts, shunt trip coils, and under-voltage releases designed for the 30A-63A frame group.
Frequently Asked Questions
What is the difference between NF63-SV, NF63-CV and NF63-HV?
All three share the same frame and current range, but differ in breaking capacity: NF63-CV (5 kA), NF63-SV (7.5 kA), NF63-HV (10 kA). The standard class NF63-SV covers most industrial applications.
Does the breaker body change between current ratings?
No. The NF63-SV uses the same physical dimensions across the entire 5A to 63A current range, with current rating set by factory calibration of the trip unit.
Is the NF63-SV certified to IEC 60947-2?
Yes. The breaker is tested and rated to IEC 60947-2 with Ics service capacity equal to 100% of Icu rating at 400V.
Can the NF63-SV be used on DC circuits?
Yes. Rated for DC operation up to 250V with 7.5 kA breaking capacity. Proper polarity orientation must be observed for DC applications.
Can accessories be field-installed?
Yes. The modular accessory system allows field installation of shunt trips, auxiliary contacts, and other accessories directly to the breaker body.
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