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.

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