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#36 in Industrial Control (B2B)
Chtaixi 20A Thermal-Magnetic DIN Rail Breaker (1-Pole, 120V/240V)
Industrial Control (B2B)

Chtaixi 20A Thermal-Magnetic DIN Rail Breaker (1-Pole, 120V/240V)

4.6(281 reviews)

$7.99reference price

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Best for

Protecting a single-leg 120V control circuit (a contactor coil, a PLC, a 24V supply) without overkilling it with a 2-pole breaker that isn't needed there.

  • DIN Rail
  • 1-Pole
  • Curve C
  • 6-63A

What is it and what's it for?

A thermal-magnetic breaker cuts current automatically on a sustained overload (thermal protection) or a short circuit (magnetic protection, near-instant). This model's Curve C trips at 5-10x rated current — a middle ground meant for loads with moderate startup surge, not as sensitive as Curve B (small motors/transformers) nor as tolerant as Curve D (large motors with heavy startup surge).

Real-world use cases

At home

In a home panel, a 1-pole breaker like this protects an individual 120V circuit (an outlet, a lighting circuit) without affecting the rest of the installation if it trips.

In a business or workshop

In the industrial panel this catalog's build guide covers, this 1-pole breaker specifically protects 120V control circuits (a contactor coil, a PLC's power feed) — for the motor's own three-phase or 240V power line, you need the matching 2- or 3-pole breaker, not this one.

How to avoid buying the wrong one

  • It's 1-pole — it interrupts a single live conductor. Don't use it on a 240V load that needs both lines disconnected; that's what the 2-pole Chtaixi already listed in this catalog is for.
  • The listing offers amperage variants from 6A to 63A at the same price — the default amperage shown may not be the one you need, confirm which you picked before checking out.
  • Curve C: not the best fit for starting large motors (Curve D is better there) or protecting small sensitive transformers (Curve B) — this is a general-purpose curve.

The investment takeaway

At $7.99 with 281 real reviews and 4.6 stars, plus Amazon's Choice and 200+ bought in the past month, it's a low-risk, low-cost part — the most expensive mistake here isn't the price, it's buying the wrong amperage or pole count and not realizing until the breaker either doesn't protect as it should, or trips constantly from being undersized.

Chtaixi 20A Thermal-Magnetic DIN Rail Breaker (1-Pole, 120V/240V)

$7.99reference price

See current price on Amazon

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