Protection Status Indicators: Lifetime Green LED Self Test 'Protection Status Monitors' For Each Phase
Shipping Weight LBS (Approx.): 23
Overview
The Surge Pure M5-1240-3 is a primary-level surge protective device (SPD) engineered to provide defense for critical electrical systems, intended for installation at service entrances or main distribution panels. This robust component supports electrical systems with a maximum service size of 2500 A. It is specified for 3∅ Delta AC service types, operating at a nominal AC line voltage of 240 VRMS and compatible with 50/60 Hz frequencies.
In plain terms, the M5-1240-3 functions to protect connected equipment from transient energy, effectively isolating sensitive systems from external utility and lightning hazards, as well as internally generated surges. The protection architecture utilizes a sophisticated two-stage, dual-mode design with Single Element (SE*) protection, capable of delivering a Total Surge Capacity of 1000 kA (at 8x20 µsec pulse) and a Max SE* Surge Current per phase of 350 kA. This significant surge capacity utilizes non-degrading SPD technology to ensure long-term AC power system integrity.
For install fit, the M5-1240-3 is housed in an indoor/outdoor (NEMA 4X) enclosure, signifying dust, drip, hosedown, and corrosion proof capability, with a size of 10½" x 8½" x 6¼" (w/¾" mounting knockout size). Overcurrent Protection for the device supports Type 1 & Type 2 installations, and the specification states "no breaker required / for fast easy panel installations, use 40 amp breaker - CODE RULE 26-420 (2)". The unit is designed for easy mounting and connection via its 36" #8 AWG Stranded Copper: 3+G leads. Always follow local electrical code and use a qualified electrician where required.
When choosing this model, verify that your system is a 3∅ Delta AC service with a nominal line voltage of 240 VRMS and 50/60 Hz frequency. Key performance metrics to confirm include the Max Continuous Operating Voltage (MCOV) of 320V and the Max. Clamping Voltage (L-L) of 520V. The device is c-ETL-us Listed and Certified to the latest UL 1449, 5th Edition / CSA C22.2 - no. 269, and its protection status is monitored by the Lifetime Green LED Self Test 'Protection Status Monitors' For Each Phase.
