Citel 277/480 Volt 50kA Surge Protection Device | 3 Phase Wye
The CITEL M50-A Series surge protective device is an excellent choice for safeguarding electrical panels in industrial control systems, thanks to its robust 50kA surge current protection and hybrid MOV-GSG technology. Its UL 1449 Type 1 listing ensures reliability for service entrance and distribution panels, while the fail-safe design and real-time diagnostics enhance operational safety. Ideal for both indoor and outdoor installations, this SPD is particularly suited for environments like manufacturing facilities and warehouses where electrical stability is crucial.
Dwayne Kula | President, CTO and Founder
Out of stock
Product Specifications
Key Features
| Brand | Citel |
| SPD Type | UL1449 TYPE 1 LISTED |
| Volts | 277/480 |
| Phase | 3Y (WYE) |
| Modes | L-L, L-N, L-G, N-G |
| Voltage Protection Rating | 2500/1200/1500/1200 |
| Maximum Continuous Operating Voltage | 560/320/320/280 |
| IN | 20 kA |
| SCCR | 150 kA |
| IMAX | 50 kA |
| Technology | MOV-GSG |
| Network Configuration | 3PH, 4W+G, Wye |
| Connection Method | 36 in #12 AWG LEADS |
| Mounting | Threaded 1/2 in NPT |
| Fail Safe | Yes, no upstream over current protection required |
| Real-Time Diagnostics | LED and audible alarm |
The CITEL M50-A Series is a panel-mounted surge protective device (SPD) designed for service entrance, branch, and distribution panel applications, featuring hybrid MOV-GSG technology, 50kA surge current protection per mode, LED status indication, and an audible alarm.
It provides L-N, L-G, and N-G protection with no leakage current, is suitable for indoor or outdoor installation, and is UL 1449 Type 1 Listed.
Additional Resources
Product Overview
The Citel M50-A Series surge protective device is a panel-mounted SPD for 277/480V, 3-phase Wye electrical systems. It provides 50kA surge current protection per mode for service entrance, branch, and distribution panel applications.
This unit uses hybrid MOV-GSG technology and protects L-L, L-N, L-G, and N-G modes. It mounts through a threaded 1/2 inch NPT connection and uses 36-inch #12 AWG leads.
Core Performance and Output
This SPD is configured for 277/480V, 3PH, 4W+G Wye networks. Its maximum surge current rating is 50kA, with a nominal discharge current rating of 20kA and a 150kA SCCR.
Voltage protection ratings are 2500V L-L, 1200V L-N, 1500V L-G, and 1200V N-G. Maximum continuous operating voltage is 560V L-L, 320V L-N, 320V L-G, and 280V N-G.
The device must be matched to a 277/480V, 3-phase Wye system. It is not configured for electrical systems outside the listed voltage and network configuration.
Adjustability and Control Options
This SPD does not use adjustable surge settings or external lighting controls. Protection is provided through the fixed MOV-GSG surge protection design.
Real-time diagnostics include LED status indication and an audible alarm. These indicators provide local operating status at the panel location.
Longevity and Reliability
The M50-A Series includes fail-safe protection and does not require upstream overcurrent protection. The unit provides no leakage current for L-N, L-G, and N-G protection modes.
LED indication and the audible alarm allow maintenance personnel to identify device status during routine electrical maintenance. The supplied data does not establish a service-life rating or replacement interval.
Build Quality and Physical Characteristics
The device is built for panel mounting through a threaded 1/2 inch NPT connection. Electrical connection is made with 36-inch #12 AWG leads.
The compact panel-mounted format supports installation at service entrance, branch, and distribution panels. The unit is suitable for indoor or outdoor installation.
Where This Product Fits Best
This surge protective device fits electrical maintenance and emergency-support work involving 277/480V, 3-phase Wye panel systems. It is used where surge protection is being added during repair, retrofit, maintenance, or code-related work.
- fixture repair and replacement
- lighting maintenance support
- retrofit support
- emergency backup integration
- code compliance upgrades
- emergency egress support
- field repair projects
The threaded NPT mounting and panel lead connections support panel-based installation. Indoor and outdoor suitability allows the device to be located where the applicable panel is installed.
Installation and Long-Term Use
Install the SPD at the applicable service entrance, branch, or distribution panel using the threaded 1/2 inch NPT mounting connection. The 36-inch leads must be routed and terminated for the listed 277/480V, 3-phase Wye configuration.
Panel location, available mounting access, and lead routing affect installation layout. LED status indication and the audible alarm should remain accessible for maintenance checks.
Protection planning depends on the electrical panel arrangement and the 3PH, 4W+G Wye network configuration. This unit does not require upstream overcurrent protection.
How This Fixture Is Commonly Used
For fixture repair and replacement, retrofit support, and lighting maintenance support, the device is mounted at the associated electrical panel rather than at the lighting fixture. Installation location follows the service entrance, branch, or distribution panel being protected.
Emergency backup integration, emergency egress support, and code compliance upgrades use the same panel-mounted arrangement. Panel access and the available 1/2 inch NPT mounting location affect final placement.
Layout varies with the panel configuration and the electrical systems included in the project. Real-time LED and audible diagnostics support ongoing maintenance review after installation.
Safety, Certifications, and Warranty
This surge protective device is UL 1449 Type 1 Listed. It has a 150kA SCCR.
The unit includes fail-safe protection and requires no upstream overcurrent protection. Refer to applicable electrical requirements for installation and system integration.
Frequently Asked Questions
Q: What electrical system is this surge protective device designed for?
A: It is designed for 277/480V, 3-phase, 4W+G Wye electrical networks.
Q: What is the maximum surge current rating?
A: The maximum surge current rating is 50kA per mode.
Q: How is the device mounted and connected?
A: The device uses threaded 1/2 inch NPT mounting and 36-inch #12 AWG leads.
Q: What diagnostics are provided?
A: The device includes LED status indication and an audible alarm for real-time diagnostics.
Application Questions and Clarification
Q: Can this device be used for lighting maintenance support?
A: Yes. Lighting maintenance support is a listed application, provided the electrical system is a 277/480V, 3-phase Wye network.
Q: What should be confirmed before planning panel placement?
A: Confirm the 277/480V, 3PH, 4W+G Wye network configuration, panel location, threaded 1/2 inch NPT mounting access, and lead routing requirements.
Q: Can the device be installed indoors or outdoors?
A: Yes. The device is suitable for indoor or outdoor installation.
Web ID: 2778
