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Grey rectangular surge protector enclosure with terminal labels visible

Mersen

Mersen STP240S07M surge protection device 120/240V 2-pole 75 kA

SKU CH-R9M8-0YVFK

Single-phase surge protector rated 120/240 V with two poles and a 75 kA capacity in a NEMA 1 polyethylene terephthalate enclosure 2.81 in deep

  • Product typePower Quality & Distribution
  • Handles 75 kA surge current for robust protection
  • 120/240 V AC rating suits split-phase panels
  • Two-pole design covers both hot conductors
  • NEMA 1 enclosure rated for indoor installation
  • 81 in depth fits standard electrical boxes

120/240 V surge protection

The Mersen STP240S07M is a single-phase surge protection device rated for 120/240 V AC systems. It uses a two-pole design to guard connected equipment against transient overvoltages in residential or light-commercial panels. The unit mounts inside a standard electrical enclosure.

75 kA capacity and headroom

A maximum surge current rating of 75 kA provides substantial headroom for typical service-entrance transients. The device absorbs repeated lightning-induced or utility switching surges until the internal components degrade, after which replacement is required. No internal disconnect indicator is mentioned in the data.

Polyethylene terephthalate enclosure

The grey housing is moulded from polyethylene terephthalate and carries a NEMA 1 rating for indoor use. Depth measures 2.81 in, allowing fit in standard panel cavities. California Proposition 65 warnings apply because the enclosure material contains listed chemicals.

How it compares

Measured against everything we stock in Electrical Enclosures & Cabinets, at today’s prices. Recalculated every night.

Price $204.99
Pricier than about 88% of the 1,411 comparable items (median $39.99).

Specifications

Product
Brand nameMERSEN
Product typePower Quality & Distribution

Questions about this item

Will the 2-pole 120/240 V design protect both legs of my existing split-phase panel?

Yes, the two poles connect across the 120/240 V split-phase supply so each hot leg is clamped to neutral during a surge.

How can I verify the STP240S07M is still active after installation?

The front-mounted status indicator shows green while the protection circuit is functional; if it turns red the module has sacrificed itself and must be replaced.

Does the box include mounting hardware or do I need to buy a separate bracket?

The device ships in its non-metallic NEMA 1 enclosure ready to mount; screws or DIN-rail clips are not included and must be sourced separately.

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