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ASI ASISP180-1P — Modular Surge Protector 1-Pole 120V, DIN Rail
Industrial Control (B2B)

ASI ASISP180-1P — Modular Surge Protector 1-Pole 120V, DIN Rail

5.0(2 reviews)

$43.68reference price

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Best for

Adding dedicated surge protection to a panel that already has its own breaker — it doesn't replace it, it adds in parallel with a remote alarm contact.

  • Surge Protection
  • 1-Pole / 120V
  • DIN Rail
  • Remote Alarm

What is it and what's it for?

An SPD (surge protection device) isn't a breaker: it doesn't interrupt normal circuit current — its job is to divert voltage spikes (a nearby lightning strike, a large motor starting elsewhere on the same system) before they reach and damage equipment further down the panel. This model uses a pluggable MOV module — if the module absorbs a large surge and degrades, you replace just the module (no rewiring the base) and the remote alarm contact flags when that happened.

Real-world use cases

At home

In a home panel, an SPD like this mounts next to the main breaker to protect sensitive appliances (an inverter-compressor fridge, a WiFi thermostat's electronics) from voltage spikes that a normal breaker doesn't catch because they aren't sustained overcurrent.

In a business or workshop

In the industrial panel this catalog's build guide walks through, this SPD mounts on the same DIN rail, in parallel with the GFCI breaker already listed (which doesn't cover three-phase current or loads beyond 120V) — it specifically protects the 120V control circuits (a PLC, a 24V supply, an HVAC transformer) that are the most vulnerable to a transient spike.

How to avoid buying the wrong one

  • It's 1 pole at 120 Vac — it won't work on three-phase or 240V lines; for that, ASI has other models in the same line with different voltage and pole counts.
  • It doesn't replace a thermal breaker or a GFCI — it installs in parallel, as additional protection against spikes, not against sustained overcurrent or ground faults.
  • The MOV module swaps out without rewiring the base, but that also means that after a large surge you need to check the visual indicator or the alarm contact to know whether it's still protecting or already degraded.

The investment takeaway

With just 2 Amazon reviews, this particular SPD still has a thin real-world track record despite the 5.0 rating — unlike the Electrodepot contactor or the DIHOOL breaker already listed in this catalog, both past 30 reviews. Even so, ASI (Automation Systems Interconnect) is an established brand in industrial surge protection, and the price ($43.68) is reasonable against the cost of replacing control electronics damaged by an unprotected voltage spike.

ASI ASISP180-1P — Modular Surge Protector 1-Pole 120V, DIN Rail

$43.68reference price

See current price on Amazon

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