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Grey non-metallic surge protection box, 2.81 inches deep

Mersen

Mersen STP120P07M Surge Protection Device 120V 1 Phase 75 kA 2.81 in

SKU CH-WWVP-9VZBJ

A 120 V single-phase surge protector rated at 75 kA in a 2.81 in deep NEMA 1 enclosure

  • Product typePower Quality & Distribution
  • Surge protection rated at 75 kA for high transient events
  • Single-phase 120 V AC design suits standard residential panels
  • Compact 2.81 in depth fits tight enclosure spaces
  • Polyethylene terephthalate housing provides NEMA 1 environmental rating
  • California Proposition 65 warning discloses cancer and reproductive-harm chemicals

120 V Single-Phase Surge Protection

The Mersen STP120P07M is a non-metallic surge protection device rated for 120 V AC single-phase systems. It provides a 75 kA surge current capacity and mounts in a standard electrical enclosure. The grey polyethylene terephthalate housing carries a NEMA 1 rating for indoor use. Installers fitting main or sub-panel protection in residential or light-commercial projects will find the 2.81 in depth compatible with common box dimensions.

Replaces Basic Strip or Panel Surge Units

This unit upgrades from simple power-strip suppressors or lower-rated panel devices that cannot handle high-energy transients. The 75 kA rating makes the jump worthwhile when the electrical service feeds sensitive electronics, HVAC controls or motor loads that demand robust clamping. It is not suited for three-phase services or voltages above 120 V AC, so buyers needing multi-phase protection must select a different model.

Two-Wire Connection in Standard Enclosure

Installation consists of landing the two conductors on the device terminals inside a NEMA 1 rated box, a task familiar to any qualified electrician. The compact 2.81 in depth eases fitment in crowded panels, yet the non-metallic enclosure must not be used where a metallic grounded can is required by code. California Proposition 65 notices apply to materials in the housing.

How it compares

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

Price $175.99
Pricier than about 85% of the 1,411 comparable items (median $39.99).

Specifications

Product
Brand nameMERSEN
Product typePower Quality & Distribution

Questions about this item

What enclosure depth and NEMA rating does the Mersen STP120P07M need for mounting?

The device is 2.81 in deep and carries a NEMA 1 enclosure rating, so it fits in standard indoor panels with that clearance.

How do I wire the single-phase, 2-wire surge protector, and what step is often missed?

Connect the two conductors to the 120 V AC supply; the step often missed is verifying the 75 kA rating matches the panel's available fault current.

When should the polyethylene terephthalate enclosure be inspected or the unit replaced?

Inspect the gray enclosure after any surge event or every 7 years; replace it if the housing shows cracks, discoloration or the status indicator signals end of life.

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