Citel 240/120 Volt 50kA Surge Protection Device | Split Phase
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
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Product Specifications
Key Features
| Brand | Citel |
| SPD Type | UL1449 TYPE 1 LISTED |
| Volts | 240/120 |
| Phase | 1S Split Phase |
| Modes | L-L, L-N, L-G, N-G |
| Voltage Protection Rating | 1200/700/1200/1200 |
| Maximum Continuous Operating Voltage | 280/140/140/120 |
| IN | 20 kA |
| SCCR | 150 kA |
| IMAX | 50 kA |
| Technology | MOV-GSG |
| Network Configuration | 1PH, 3W+G, Split Phase |
| 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 240/120V split-phase electrical systems. It provides surge protection across L-L, L-N, L-G, and N-G modes.
This unit is designed for service entrance, branch, and distribution panel installation. It uses hybrid MOV-GSG technology and provides 50kA maximum surge current protection per mode.
Core Performance and Output
This SPD supports 1-phase, 3-wire plus ground split-phase networks at 240/120V. The nominal discharge current rating is 20kA, maximum surge current rating is 50kA, and SCCR is 150kA.
Voltage protection ratings are 1200V for L-L, 700V for L-N, 1200V for L-G, and 1200V for N-G. Maximum continuous operating voltage is 280V L-L, 140V L-N, 140V L-G, and 120V N-G.
Light output, beam distribution, and fixture efficiency do not apply to this device. Electrical system configuration must match the 240/120V split-phase network requirement.
Adjustability and Control Options
The device does not include output adjustment or lighting controls. Its protection configuration is fixed for L-L, L-N, L-G, and N-G surge modes.
Real-time diagnostics include LED status indication and an audible alarm. These indicators identify device status without requiring separate monitoring equipment.
Longevity and Reliability
The MOV-GSG design provides surge protection with no leakage current on L-N, L-G, and N-G protection paths. The unit includes fail-safe behavior.
No upstream overcurrent protection is required for this SPD. Diagnostic LED indication and the audible alarm support maintenance checks after surge events.
Build Quality and Physical Characteristics
The device uses 36-inch #12 AWG leads for electrical connection. It is configured for threaded mounting through a 1/2-inch NPT opening.
The supplied product information also identifies a side-mount threaded M22 adapter. Installation must account for panel wall clearance, lead routing, and access to the LED indicator and audible alarm.
Where This Product Fits Best
This SPD fits electrical protection work associated with fixture repair, replacement, retrofit support, emergency backup integration, and lighting maintenance support. It is intended for panel-mounted installation in indoor or outdoor locations.
- fixture repair and replacement
- lighting maintenance support
- retrofit support
- emergency backup integration
- code compliance upgrades
- field repair projects
UL 1449 Type 1 listing supports installation at service entrance, branch, and distribution panels. The 240/120V split-phase configuration must match the electrical system being protected.
Installation and Long-Term Use
Install the device through the threaded panel opening and connect the 36-inch #12 AWG leads to the applicable split-phase system conductors. Confirm L-L, L-N, L-G, and N-G connections match the panel configuration.
Mounting height is not established by the supplied product data. Panel location, service access, lead routing, and visibility of diagnostic indicators affect the final installation position.
How This Fixture Is Commonly Used
For fixture repair and replacement, lighting maintenance support, retrofit support, and field repair projects, the SPD is mounted at the applicable electrical panel rather than at the fixture. Installation layout follows the location and configuration of the protected service entrance, branch, or distribution panel.
Mounting height is governed by the panel installation location and access requirements. Lead routing and available panel space affect placement because the unit uses 36-inch leads.
Protection layout varies with the electrical system arrangement. The device is specifically configured for 240/120V, 1-phase, 3-wire plus ground split-phase networks.
Safety, Certifications, and Warranty
This surge protective device is UL 1449 Type 1 Listed. It is UL Listed.
The unit includes fail-safe behavior and does not require upstream overcurrent protection. Warranty information is not included in the supplied product data.
Frequently Asked Questions
Q: What electrical system is this surge protective device designed for?
A: It is designed for 240/120V, 1-phase, 3-wire plus ground split-phase networks.
Q: What surge protection modes does the device provide?
A: It provides protection for L-L, L-N, L-G, and N-G modes.
Q: What is the maximum surge current rating?
A: The IMAX rating is 50kA.
Q: How does the device report its operating status?
A: It includes LED status indication and an audible alarm for real-time diagnostics.
Q: Is upstream overcurrent protection required?
A: No. The supplied product data states that no upstream overcurrent protection is required.
Application Questions and Clarification
Q: Can this device support fixture repair and replacement work?
A: Yes. Fixture repair and replacement is a listed application for the Drivers and EMBs product family.
Q: Can this SPD be used for lighting maintenance support?
A: Yes. Lighting maintenance support is a listed application, provided the protected system is a 240/120V split-phase network.
Q: What should be reviewed when planning panel placement?
A: Confirm the panel configuration, threaded mounting location, available lead routing, and access to the LED and audible diagnostics. Specific mounting height and spacing values are not established by the supplied product data.
Web ID: 2753
