Circuit Breaker
AC MCB 1P–4P 3–63 A, DC MCCB up to 1000 V DC for PV and battery main switching.
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Manufacturer Since 24 Years · Wenzhou, China
Low-Voltage Circuit Protection & Solar PV Electrical Components Manufacturer
Zhejiang TMB Electric Co., Ltd. designs and manufactures AC/DC miniature circuit breakers, DC molded case circuit breakers, PV combiner boxes, dual power automatic transfer switches, surge protective devices and smart protection relays for distributors, panel builders, EPC contractors and solar installers in more than 100 export markets.
- Production base in Liushi Town — China's largest low-voltage electrical cluster — giving short lead times for copper parts, housings and contacts.
- Factory assessed on-site by TÜV Rheinland; certified quality management system; CE-marked product models.
- Low trial MOQ (from 5 pcs) plus OEM/ODM private label and custom combiner box configurations.
0+Years in Industry
0 m²Production Floorspace
0Verified Staff
US$0MAnnual Export
0Product Lines
Product Categories
Protection, Switching & Control Devices for Every Distribution Board
One source for the complete DIN-rail line-up: from string-level DC protection in solar arrays to final-circuit AC breakers, backup power transfer and smart energy monitoring.
PV Combiner Box
IP65 pre-wired boxes with DC breaker, fuse and SPD; 1-in-1-out to multi-string designs.
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Transfer Switch
DIN-rail ATS 2P/3P/4P, 63/100/125 A, for grid-generator and grid-inverter backup.
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Over & Under Voltage Protector
Adjustable thresholds, over-current limit and kWh display; 1-phase and 3P+N versions.
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Surge Protection Devices
DC SPD 500–1000 V, 10–20 kA / 20–40 kA, for PV arrays, inverters and battery systems.
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WiFi Smart Home
App-controlled breakers with kWh metering, timer and remote on/off for 110/220 V circuits.
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Timer Switch
7-day programmable, Bluetooth and multi-function time relays for lighting, pumps and HVAC.
View range About the Manufacturer
Built in Liushi, Engineered for Global Electrical Standards
Zhejiang TMB Electric Co., Ltd. has spent 24 years in the low-voltage electrical industry. Our factory in Huabei Village, Liushi Town, Wenzhou sits inside a supply chain where breaker mechanisms, silver contacts, arc chutes and flame-retardant housings are produced within a few kilometres — this is how we keep tooling cost, sample lead time and component traceability under control.
We focus on the devices that protect modern hybrid power systems: DC protection for solar strings and batteries, automatic transfer between grid and backup sources, and voltage and surge protection for sensitive loads. Products ship to distributors, wholesalers, panel builders and solar EPCs who need consistent quality across repeat orders.
Dedicated Production Lines
Custom manufacturer with in-house assembly and testing for protection devices.
Third-party Verified
On-site factory assessment by TÜV Rheinland; QMS certified.
OEM / ODM
Private label printing, packaging, rating combinations and box layouts.
Global Export Expertise
More than 10 years of export experience assessed by independent third parties.
5,700 m²Verified Floorspace
Factory Tour
Inside Our Production & Quality Control Workflow
Real workshop imagery from our Wenzhou facility. Every protection device passes through defined inspection checkpoints before packing.
Incoming Check
Contacts, bimetals, copper busbars and housings sampled against drawings.
Assembly
Mechanism and terminal torque controlled at fixed workstations.
Trip Calibration
Thermal and magnetic trip points verified against the rated curve.
Dielectric Test
Insulation and withstand voltage checked between poles and to frame.
Function Test
ATS transfer, protector thresholds and timer programs tested at power.
Final Audit
Marking, packaging and carton labels audited before shipment.
Application Scenarios
Solution-level Product Combinations
Buyers rarely purchase a single component. These are the device combinations our customers most often order together for complete systems.
Rooftop & Utility Solar PV
String combining and DC isolation between PV modules and the inverter: DC MCB or fuse per string, DC SPD on the output and an IP65 enclosure for outdoor mounting.
Residential Distribution Boards
Final-circuit protection for homes and apartments with AC MCBs, AC SPD at the incomer and an adjustable voltage protector to guard appliances against grid swells and sags.
Backup Power for Shops, Clinics & Telecom
Automatic switching between grid and generator or inverter output keeps critical loads running. Pair the ATS with metering and timer control for load scheduling.
Smart Home & Energy Monitoring
Remote on/off, kWh tracking and scheduling from a phone app — ideal for rental properties, water heaters, EV charging circuits and pumps.
Solar Series
Explore full series PV Combiner Box & Distribution Enclosures
Pre-assembled, pre-wired enclosures that reduce installer labour on site. Configure breakers, fuses and SPD per string count and system voltage.
| Model | Configuration | Key Data |
|---|---|---|
| HT 2-Way PV Box | 1 input / 1 output, DC breaker, matching wires | IP65 waterproof |
| 8-Way DC Box | 1 in / 1 out with breaker, fuse, SPD, dual terminals | 600 V DC, 16–63 A |
| HT Distribution Box | 5 / 8 / 12 / 15 / 18 ways, MCB enclosure | Outdoor waterproof |
| HT-9WAY ATS Box | Dual power ATS + 7-day timer, pre-wired | 2P 63 A, 220 V AC |
| Dual Power Box | ATS output with MCB overload/short-circuit protection | 2P 63 A |
CE
IP65 Solar PV Combiner Box, 1-In 1-Out with DC Breaker
IP652 waysPre-wired
8-Way 600 V DC Box with Breaker, Fuse & SPD
600 V DC16–63 ASPD
HT Outdoor Waterproof Distribution Box, 5–18 Ways
PlasticOutdoorMCB enclosure
HT-9WAY Box with Dual Power ATS & 7-Day Timer
2P 63 A220 V ACTimer
Protection Series
Explore full series AC / DC Miniature & Molded Case Circuit Breakers
High-volume protection devices for final circuits, PV strings and battery main switching. Our 1P AC MCB alone shipped close to 10,000 units in 180 days.
| Model | Type | Ratings |
|---|---|---|
| TOB1-63H | 1P AC MCB, C curve | 230/400 V~, 50/60 Hz, 3–63 A |
| 2P DC MCB | Solar mini breaker | 1000 V DC, 3–63 A |
| 2P DC MCB HC | High current, C curve | 600 V DC, 80 / 100 / 125 A |
| TOM7Z | 2P DC MCCB | 1000 V DC, PV overload protection |
| DC MCCB B | 2P DC MCCB, B curve | 500 V DC |
Best Seller
TOB1-63H 1P AC MCB, C Curve 3–63 A
230/400 V~50/60 HzCE
CE
2P DC MCB 1000 V for PV Systems, 3–63 A
1000 V DC2 PolePV
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2P DC MCB 600 V, 80–125 A Battery Main Switch
600 V DCC curveCE
CE
TOM7Z 2P 1000 V DC Solar MCCB
1000 V DCMCCBOverload
Backup Power Series
Explore full series Dual Power Automatic Transfer Switch (ATS)
DIN-rail mounted, uninterrupted transfer between two sources. Available in 110/120 V and 220/230 V versions with single and three-phase pole options.
| Model | Poles / System | Ratings |
|---|---|---|
| ATS 2P 230 V | 2P, single phase | 220/230 V, 63 / 100 / 125 A |
| ATS 2P 120 V | 2P, single phase | 110/120 V, 63 / 100 / 125 A |
| ATS PV/Inverter | 2P, grid + inverter | 63 / 100 / 125 A |
| ATS 3P / 4P | Three phase (4P switches N) | 63 / 100 / 125 A |
| TOQ3 | 2P / 4P MCB type, indicator light | 63 / 125 A, 50/60 Hz |
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TOQ3 2P MCB-Type ATS, 63–125 A, Indicator Light
2 in / 2 out230 VCE
CE
TOQ3 4P MCB-Type ATS for Three-Phase Systems
4P63–125 A50/60 Hz
CE
DIN Rail 3-Phase ATS 3P, 63/100/125 A
3P220/230 VUninterrupted
CE
Single-Phase ATS for PV & Inverter Backup
2P63–125 AHybrid PV
More Proven Lines
Voltage Protection, Timing & Surge Protection Devices
Supporting devices that complete a distribution board and frequently appear on the same purchase order.
CE
Best Seller
Certificates & Compliance
Documented Quality You Can Verify Before You Order
Certificates, test reports and the third-party factory assessment are available for review. Ask for the documents of the exact model you plan to import.
TÜV Rheinland Assessed
On-site verification of facility, staff and production capability.
CE Marked Models
Breakers, ATS, PV boxes and protectors for EU-market compliance.
QMS Certified
Quality management system certification with inspected materials.
Reports on Request
Datasheets, test reports and declarations supplied per model.
Buyer's Technical Guide
How to Specify the Right Device for Your Project
Most returns and field failures in low-voltage protection come from mismatched ratings, not defective parts. Confirm these parameters before sending your requirement.
| Application | Recommended Device | Parameters to Confirm | Common Mistake to Avoid |
|---|---|---|---|
| PV string protection | 2P DC MCB or PV fuse in combiner box | Rated DC voltage ≥ string Voc at the coldest site temperature; current ≈ 1.25 × Isc or per module fuse rating | Using AC MCBs on DC — DC arcs have no zero-crossing and may not extinguish |
| Battery / inverter DC main | 2P DC MCB 80–125 A or DC MCCB | Battery bank voltage, continuous current, breaking capacity, polarity marking | Reversing polarity on polarized DC breakers during wiring |
| Grid / generator backup | Dual power ATS 2P / 3P / 4P | Phase system, nominal voltage 120 V or 230 V, load current, whether neutral must be switched | Choosing 3P where the generator neutral must be isolated (use 4P) |
| Unstable grid voltage | Over & under voltage protector | Adjustable trip window, reconnection delay, rated current 40/63/80 A | Setting recovery delay too short for compressor loads |
| Lightning & switching surges | AC SPD at incomer, DC SPD at PV input | Uc (max. continuous voltage), In / Imax, protection level Up vs. equipment withstand | Installing SPD without back-up overcurrent protection |
| Scheduled loads | Digital / Bluetooth timer switch + contactor | Supply voltage, contact rating, number of programs; use a contactor for inductive or high loads | Switching motors directly through a 16 A timer contact |
This guide is general engineering information. Final selection must follow local wiring regulations and the device datasheet. Our engineers can review your single-line diagram.
FAQ
Questions Overseas Buyers Ask Before Ordering
Is Zhejiang TMB Electric Co., Ltd. a manufacturer or a trading company?
We are a manufacturer with an integrated export team. Our production base in Liushi Town, Wenzhou covers about 5,700 m² with 92 staff, and the facility has been assessed on-site by TÜV Rheinland.
What is the minimum order quantity?
Most catalog models start from 5 pieces, and some timer switches from 1 piece, so buyers can test samples before volume orders. OEM branding and custom configurations are discussed per project.
Can an AC MCB be used on solar PV DC strings?
No. DC current has no natural zero-crossing, so the arc is harder to extinguish. Use a DC-rated MCB or MCCB whose rated DC voltage is at least the string open-circuit voltage at the lowest site temperature, and observe the marked polarity during wiring.
How do I choose the correct dual power automatic transfer switch?
Confirm the system type (2P for single phase, 3P or 4P for three phase; 4P also switches the neutral), the rated voltage (110/120 V or 220/230 V), the rated current of the load (63 A, 100 A or 125 A) and whether the application is grid-generator or grid-inverter backup.
Do you offer OEM and ODM services?
Yes. We support private label printing, custom packaging, current and voltage rating combinations, and custom PV combiner box configurations with breakers, fuses and SPD matched to your string design.
Which certifications and documents can you provide?
Listed models carry CE marking, the factory operates a certified quality management system and has a TÜV Rheinland on-site assessment report. Test reports, datasheets and declarations can be requested per model before ordering.
Planning a Distribution or Solar Project?
Share your single-line diagram, ratings and target market — our team replies with matched models and documents.
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