NanoShield MCCB Molded Case Circuit Breakers
Precision overcurrent protection with electronic trip intelligence for demanding industrial applications.
Overview
The NanoShield MCCB family offers molded case circuit breakers from 15 A to 2,500 A with advanced electronic trip units featuring true-RMS sensing and configurable time-current curves. Designed for use in Heritage HT-LV switchgear, panelboards, and standalone enclosures, these breakers combine high interrupting capacity with compact footprints. Optional zone-selective interlocking and integrated ground fault protection ensure coordinated, selective fault clearing.
Key Features
- Electronic trip units with true-RMS current sensing and adjustable LSIG settings
- Interrupting capacities up to 100 kA at 480 V AC
- Rotary and toggle handle mechanisms with lockout/tagout provisions
- Zone-selective interlocking (ZSI) for faster upstream coordination
- Integrated ground fault protection (adjustable pickup and delay)
- Modular accessories: shunt trip, undervoltage release, auxiliary contacts, alarm switch
Technical Specifications
| Specification | Value |
|---|---|
| Frame Sizes | 125 A / 250 A / 400 A / 600 A / 800 A / 1,200 A / 2,500 A |
| Voltage Rating | 240 V / 480 V / 600 V AC; 250 V / 500 V DC |
| Interrupting Capacity | 25 kA to 100 kA at 480 V AC (frame-dependent) |
| Trip Unit | Thermal-magnetic or electronic (LSIG) selectable |
| Poles | 1P, 2P, 3P, 4P |
| Operating Temperature | -25 C to +60 C (with derating above 40 C) |
| Mechanical Life | 10,000 operations (no load) |
| Electrical Life | 5,000 operations (at rated current) |
| Dimensions (3P, 250 A frame) | 5.5"W x 7.1"H x 4.3"D (140 x 180 x 109 mm) |
| Weight (3P, 250 A frame) | 4.2 lbs (1.9 kg) |
Applications
Certifications & Compliance
Get Started
Ready to specify this product for your project? Our engineering team is here to help.
Related Products
NanoShield MCB Miniature Circuit Breakers
Compact, DIN-rail-mount circuit protection for branch circuits and control systems.
HT-LV Series Low-Voltage Switchgear & Panelboards
Compact, high-performance low-voltage switchgear and panelboards for commercial and industrial power distribution.
Heritage MCC Motor Control Centers
Configurable motor control centers that simplify wiring, commissioning, and ongoing maintenance.
Need a Custom Configuration?
Our engineering team can customize any product to meet your specific requirements.