Factory-direct MCBs with full UL 489 listing, 22kA breaking capacity, and 24-hour quote turnaround. Trusted by 500+ OEMs and distributors across 50+ countries.
Fast response for all inquiries
Full branch circuit protection
Request samples for evaluation
Global shipping FOB Shanghai
DIN rail and plug-in miniature circuit breakers for every US HVACR and industrial application
UL Listed
UL Listed
UL Listed
UL Listed
UL Listed
UL Listed
UL Listed
UL Listed
We don’t just sell circuit breakers — we help engineers, contractors, and distributors solve real protection problems with products designed for the United States standards.
Engineered with precision trip curves to protect circuits without shutting down operations unexpectedly. Keep your systems running longer.
For: HVACR ContractorsUnlike UL 1077 supplementary protectors, our UL 489 breakers qualify as the sole overcurrent device. Pass your AHJ inspection first time.
For: Panel Builders & OEMsSkip the middleman. Direct from our Hangzhou factory with flexible MOQs, competitive unit pricing, and volume discount tiers for distributors.
For: Distributors & ResellersStandard 35mm DIN rail mounting with optional front-and-bottom feet. Compatible with existing enclosures — zero panel redesign required.
For: Industrial IntegratorsEvery breaker passes electrical testing in our in-house certified lab. Traceability documentation and test reports available on request.
For: Quality-Critical BuyersAccess our engineering team for application review, spec matching, and cross-referencing competitive models. We help you choose the right product.
For: Engineers & SpecifiersTell us your requirements — we’ll match you to the right product and spec sheet
See the automated lines, certified testing lab, and meticulous packing operations that back every circuit breaker we ship.
PLM + ERP + MES integrated digital factory system — real-time process control from component to finished MCB.
IATF 16949 Compliant
First-tier manufacturer since 2004 — 20+ years of electrical expertise.
Est. 2004
100% electrical testing. Every unit. Zero exceptions.
ISO 9001 Lab
Installed in commercial HVAC systems across North America.
UL 489 Listed
Export packaging built for sea freight. FOB Shanghai / Ningbo.
Global LogisticsEvery product is rigorously tested and independently certified before leaving our factory
Full branch circuit protection certification for the United States markets. Suitable as sole overcurrent protection device.
Cert No. E535785Quality management certified. Every unit undergoes 100% electrical testing in our in-house certified laboratory.
Quality ManagementGlobally recognized certifications for European and Chinese markets, in addition to full UL listing for North America.
Multi-Market Ready
Every unit tested before delivery
HIITIO is a first-tier electrical equipment manufacturer in Hangzhou, China with over 20 years of focus on circuit protection and power components for demanding global markets.
Full branch circuit protection listing (E535785). Fully interchangeable with major brands.
100% electrical testing before every shipment — zero shortcuts.
Receive a detailed quote within 24 hours. Samples available for evaluation upon request.
T/T, L/C, PayPal, credit card accepted. FOB Shanghai / Ningbo with global freight partners.
UL 489 listed circuit breakers for a wide range of the United States residential, commercial, and industrial applications
Heating, air conditioning, and refrigeration systems requiring reliable branch circuit protection.
UPS, switching power supplies, and inverters where precise overcurrent protection is critical.
Electrical distribution panels for lighting, appliances, and all household circuit protection needs.
Manufacturing plants, warehouses, and construction sites protecting motors, control panels, and machinery.
Everything you need to know before placing an order. Can’t find your answer? Our team responds within 24 hours.
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