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Grey non-metallic surge protector box, 2.81 in deep, NEMA 1 enclosure

Mersen

Mersen STP120P07 Surge Protection Device 120V 1 Phase 75 kA 2.81 in

SKU CH-A4MJ-G735K

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

  • Product typePower Quality & Distribution
  • Protects 120 V single-phase circuits from damaging transients
  • 75 kA surge capacity handles large lightning-induced spikes
  • Compact 2.81 in depth fits tight panel spaces
  • NEMA 1 polyethylene terephthalate enclosure resists indoor environmental exposure
  • California Proposition 65 notice discloses regulated chemical content

Surge Protection Device 120V 1 Phase

The Mersen STP120P07 is a surge protection device rated for 120 V AC single-phase supplies. It uses a non-metallic polyethylene terephthalate enclosure with a NEMA 1 rating and a depth of 2.81 in. The unit handles a surge current of 75 kA.

Installations needing basic 120 V surge defence

This device suits electrical panels that require a compact 1-pole, 2-wire protector for 120 V circuits. It is not for three-phase systems, higher-voltage networks or applications that demand a NEMA rating above 1. Buyers needing additional poles or a different enclosure type should look elsewhere.

75 kA surge current rating

The 75 kA rating defines the maximum surge current the device can divert. Match this figure to the prospective surge level at the installation point to confirm the part is adequate.

How it compares

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

Price $104.99
Pricier than about 76% of the 1,411 comparable items (median $39.99).

Specifications

Product
Brand nameMERSEN
Product typePower Quality & Distribution

Questions about this item

Does the surge protection device require any maintenance or replacement parts over time?

The unit is a sealed, non-serviceable surge protector; once it has absorbed its rated energy it must be replaced rather than repaired.

What is the first limit that appears during sustained surge events?

The 75 kA surge current rating defines the maximum single-pulse withstand before the internal components reach their limit.

How much heat or noise does the device produce when operating continuously?

As a passive surge suppressor it generates no audible noise and negligible heat under normal 120 V operation.

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