Mersen Launches New Critical Power Panelboard (CPP)
March 6, 2026
Mersen Has Introduced the CPP as the Latest in Their Portfolio of Fully Customizable Fused Panelboards
Mersen’s Critical Power Panel (CPP) series panelboard is designed with crucial applications in mind. Mersen’s CPP offers installers quicker specification, easier installation, and customers a lower cost option. This lightweight panelboard, in a smaller footprint, and with in-house sourced components, translates into better design control and improved availability.
Features & Options
- Integral Surge Protection (required on critical circuits)
- Feed Through Lugs
- Standard Dual/Sub Feed Lugs on MLO Mains
- Preconfigured options available
- Patented “Z” Bus Bar
Applications
- UPS Systems
- Data Centers
- Medium Voltage eHouses
- Emergency Circuits
- Legally Required Standby Systems
- Lighting loads or any load up to 30A
- DC applications for Utility and Railway markets
Additional Benefits
- Few connection points to minimize electrical/mechanical points of failure
- Robust steel back plate
- High interrupting rating – up to 200kA with up to a 400A fuse (main or remote)
- Easy selective coordination using Mersen Amp-Trap 2000 fuses or any other Class CC fuses for branch circuit protection
This UL 67 panelboard has multiple options for switched fused mains, up to 400A, featuring Mersen’s UL 98 rated Compact Fused Disconnect (CEP) and Amp-Trap 2000 Class CC fuses for branch circuit protection. Fuses can be changed for the application to offer more time delay or faster protection based on the application. The panel, main, and branch circuits can be applied up to 600VAC or 125VDC. These benefits lead to a panelboard that is easy to apply, install, and maintain while serving your most important electrical loads.
The Mersen Critical Power Panel is a highly configurable panelboard with many options. Please contact Mersen’s panelboard team at 978-465-4977 or email fusedpanelboards.ep@mersen.com for submittal and bid packages.
Specifications
Mechanical Characteristics
| cULus Certification | UL 67 & CSA 22.2 |
| IEC Certification | IEC 60529 IP20 |
| Touchsafe Design | Personnel have no exposure to energized Components during operation of the system |
Electrical Characteristics
| System Ampacity | 250A or 400A |
| Branch Circuit Ampacity | 30A CC |
| Voltage Rating | 600VAC & 125VDC |
| Voltage Type | Delta or Wye / 1ph or 3ph / 2, 3, or 4 wire |
| Withstand (SCCR) | 200kA with upstream protection (25kA standalone) |
| Neutral | 100A, 200A, 250A Models: 200% neutral; 400A Models: 125% neutral |
Configurations
| Enclosure | UL 50 Type 1 |
| Interior Only | Available as Single Unit |
| Main Incoming | MLO: (1) #2 to 750 kcmil (2) 1/0 to 350 kcmil 100A MFS: #2 to 2/0 200A MFS: #6 to 300 kcmil 400A MFS: #2 to 600 kc mil |
| Single Cable | (2) #4-4/0 Compression Lug |
| Single Cable | #4-4/0 Crimp Lug |
| Parallel Cables | #8-1/0 Compression Lug |
| Parallel Cables | #8-1/0 Crimp Lug |
| Branch Configuration | Double Column |
| Circuits | 24, 36, 42 |
Compatibility
| For use with Mersen Model CEP – Compact Fused Disconnect |
Selective Coordination
Achieving selective coordination typically requires a costly short circuit current study. However, with the Critical Power Panel (CPP), coordination can easily be determined with upstream Mersen fuses. Mersen’s new CPP utilizes its Compact Fused Disconnect and Amp-Trap 2000 ATDR or any other Class CC fuses for branch circuit protection. Simply maintain a 2:1 ratio with upstream Amp-Trap 2000 fuses and the system will coordinate.
A system that is selectively coordinated will ensure that any fault condition is localized to the nearest overcurrent protective device. This increases system reliability and decreases downtime. By localizing a fault to the nearest overcurrent device, selective coordination prevents unnecessary disconnection from other circuits in the system. An electrical system that utilizes Mersen fuses can be selectively coordinated simply by meeting the minimum fuse rating ratios. By adhering to the minimum fuse ratios, engineers and installers can save time and money because no complex coordination study is required.
For more information on Mersen solutions HERE
CPP CPP
