A 1″ plug-in GFCI breaker built to UL 489 & UL 943 standards for safer homes and code-ready installs — protect kitchens, bathrooms, garages, and outdoor circuits without redesigning your panel.
Sample units available for qualified contractors and distributors.
Overcurrent protection alone leaves a gap. Here’s what changes with 5mA-rated GFCI protection.
Four core advantages that set the HQ140 apart from standard GFCI breakers.
Trips at a rated residual operating current (IΔn) of just 5mA, well below the level that can cause shock injury.
10kA breaking capacity and 3,000A residual making/breaking capacity clear faults safely without nuisance tripping.
Designed to meet UL 489 (molded-case breakers) and UL 943 (5mA GFCI) construction standards.
6,000 electrical / 10,000 mechanical operations, 4kV impulse withstand, and 3kA surge resistance.
The core numbers that matter when you’re specifying panel protection.
| Parameter | Standard MCB | HQ140 GFCI |
|---|---|---|
| Ground-Fault Detection | Not included | 5mA (IΔn) |
| Interrupting Capacity (Icn) | Varies | 10kA |
| Standards Referenced | Built to UL 489 | Built to UL 489 + UL 943 |
| 2023 NEC GFCI Zones | Not applicable | Designed to meet requirement |
| Visual Trip Indicator | Trip flag only | Red fault-trip window + test button |
| Installation Format | 1" plug-in / snap-on | Same footprint — drop-in swap |
Complete technical data from the HQ140 datasheet.
| Rated Current (In) | 15A / 20A / 25A / 30A / 40A |
| Trip Curve | 10–20 In |
| Model | Snap-on style |
| RCD Type | AC |
| Pole | 1P |
| Rated Voltage (Ue) | 120V |
| Pigtail | T: Long · S: Short |
| Rated Frequency | 60Hz |
| Rated Residual Operating Current (IΔn) | 5mA |
| Rated Breaking Capacity (Icn) | 10kA |
| Rated Residual Making/Breaking Capacity (IΔm) | 3,000A |
| Rated Impulse Withstand Voltage (Uimp) | 4kV |
| Surge Current Resistance (8/20μs) | 3kA |
| Electrical Life | 6,000 operations |
| Mechanical Life | 10,000 operations |
| Pollution Degree | 2 |
| Protection Degree | IP20 |
| Weight | About 190g |
| Bidirectional | No — connect per markings |
| Ambient Air Temp. (Operation) | 104°F (40°C) |
Real-world advantages for electricians, builders, and property owners.
1″ plug-in / snap-on design drops straight into standard load centers — no rewiring the panel, no special tools, no re-certification of the box.
Meet 2023 NEC dwelling-unit GFCI requirements without redesigning electrical plans — five ampere ratings let you standardize across an entire development.
A visible trip indicator (red = tripped) and a monthly test button make it simple to confirm the breaker is working — no need to call an electrician just to check status.
Code-required GFCI locations across residential and light commercial buildings.
Kitchens, bathrooms, laundry rooms, garages, and outdoor receptacles.
Standardize on HQ140 across a build to simplify inspection.
Swap out older breakers when a panel is updated or replaced.
Personnel-level ground-fault protection in compatible load centers.
20 years of manufacturing DC and AC protection devices, trusted in 50+ countries.
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Long and short pigtail variants — confirm fit against your panel before ordering.
The HQ140 drops into standard load centers using the same install flow as any 1″ plug-in breaker.
Shut off the main breaker before any work begins.
Plug the 1" breaker into the open bus slot.
Wire line/load and neutral per the markings — T or S length.
Press TEST to confirm the GFCI function trips correctly.
We swapped our standard breaker spec for HQ140 across a 40-unit build. Same install time, same panel footprint — the UL 489/943 reference spec sheet made it easy to walk the inspector through compliance.
— Illustrative example based on typical distributor feedback, not an actual customer quote
Common questions from electricians and buyers about the HQ140 GFCI breaker.
A standard breaker protects wiring and equipment from overcurrent and short circuits. A GFCI breaker like the HQ140 adds a second layer of protection — it detects tiny current leaks to ground (as low as 5mA) that can cause electric shock, even when the current is too small to trip a standard breaker.
The HQ140 uses a standard 1″ plug-in / snap-on form factor with AWG14–10 (Cu/Al) output connection capacity. Confirm your load center brand and slot type before ordering — we’re happy to advise if you send us your panel model.
Pigtail length depends on the distance between the breaker slot and the panel’s neutral bar. Long pigtail (T) suits panels where more reach is needed; short pigtail (S) suits tighter panel layouts.
Press the TEST button once a month. This confirms the ground-fault detection circuit is functioning correctly. If the breaker doesn’t trip during a test, it should be replaced promptly.
No. The HQ140 must be connected according to the line/load markings on the unit — connecting it incorrectly can prevent proper ground-fault detection.
Get pricing, samples, or bulk quotes from our team within 24 hours.
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HIITIO® was established in 2018 as a result of Hecheng Electric introducing a mature R&D team. HIITIO specializes in producing high-voltage DC electrical devices for EV, solar energy systems, and energy storage applications.
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