CE Certified Miniature Circuit Breaker Manufacturer & Supplier for the Phnom Penh Market

Precision Low-Voltage Protection, DC Photovoltaic Isolation, and Modular Automation Engineered for Cambodia's Tropical Climate and Expanding Power Grid.

Direct Factory Distribution

Featured DIN-Rail Protection & Automation Hardware

Engineered to IEC/EN 60898-1 and IEC 60947-2 standards, our modular devices provide certified circuit interruption, automatic load transfer, and smart timing control across Phnom Penh's commercial, residential, and industrial distribution boards.

TOS6-40 Bluetooth Time Control Switch 35mm DIN Rail Wall-mounted Timing Countdown Loop
TOS6-40 Bluetooth Time Control Switch 35mm DIN Rail
AC85-265V 40A high-capacity contactor relay. Dual DIN-rail & wall-mount housing with app countdown loop cycles.
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TOMZN Din Rail Single Phase Weekly 7 Days Programmable Digital TIME SWITCH Relay Timer
Din Rail Weekly 7-Day Digital Time Switch Relay
Programmable digital LCD timer supporting 16A loads at AC 220V/230V or multi-voltage DC 12V/24V/48V circuits.
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TORT7 Series Delay-ON Delay-OFF 10in1 Asymmetric Cycler Time Relay Multi-function Timer
TORT7 10-in-1 Multi-Function Delay & Cycler Relay
0.1s to 10-day asymmetric cycle timing, pulse generator, delay-on, and delay-off modes for motor & HVAC sequencing.
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TOMZN TOS7-B Bluetooth Smart Timer Switch 40A 63A 85-265V EasyCon App Remote Control
TOS7-B Smart Bluetooth DIN-Rail Switch (40A/63A)
Heavy-duty remote switching via EasyCon app. 28-group customizable schedule loops for commercial cooling and pumps.
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TOMZN Bluetooth Smart Timer Switch 85-265VAC 10A 30A EasyCon Wall-mounted Countdown
Wall-Mounted Smart Bluetooth Switch 10A-30A
AC 85-265V wide input range, surface mounting tabs, automated countdown, and cyclic energy-saving automation.
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TOMZN 1NO 1NC Din Rail Single Phase Weekly 7 Days Programmable Digital TIME SWITCH Relay
1NO+1NC Single Phase 7-Day Digital Time Switch
Independent normally open and normally closed auxiliary contacts for dual-circuit automation and pump interchange.
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TOB1-63H 1P AC Miniature Circuit Breaker C Curve 3-63A CE Certified
TOB1-63H 1P AC Miniature Circuit Breaker (3-63A)
CE Certified C-Curve breaker, 230V/400V 50/60Hz, 6kA/10kA breaking capacity for residential & commercial boards.
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2P DC MCB 1000V Solar PV Miniature Circuit Breaker
2P DC 1000V Solar Photovoltaic Miniature Breaker
Non-polarized permanent magnetic arc blowout, 3A-63A, designed specifically for solar combiner boxes & string arrays.
View DC Range
24+
Years Manufacturing Experience
5,700 m²
TÜV Assessed Production Facility
100%
CE Compliant Low-Voltage Lineup
5 PCS
Ultra-Low Trial MOQ for Importers
Whitepaper & Field Analysis

Engineering Circuit Breakers for Phnom Penh's Tropical Electrical Infrastructure

Phnom Penh is experiencing the fastest urban and industrial transition in Southeast Asia. From towering mixed-use developments along Norodom Boulevard to sprawling logistics hubs and garment manufacturing clusters in Khan Pur Senchey and the Phnom Penh Special Economic Zone (PPSEZ), electrical distribution systems are under unprecedented operational stress.

The municipal grid, managed under Electricité du Cambodge (EDC), faces two pronounced structural challenges: elevated ambient tropical temperatures and pronounced seasonal grid volatility. Ambient shade temperatures regularly exceed 38°C between March and May, pushing enclosed internal panel board temperatures beyond 55°C. Miniature Circuit Breakers (MCBs) calibrated under standard European laboratory assumptions (30°C per IEC 60898-1) experience premature nuisance tripping or progressive thermal fatigue unless properly de-rated and constructed with high-grade bimetallic elements.

Furthermore, Cambodia’s high keraunic levels (frequent lightning strikes along the Tonle Sap and Mekong river basins during the monsoon season) coupled with rapid switching transients from local standby diesel generators demand circuit protection solutions that maintain structural integrity under persistent surge exposures.

Distribution board circuit breakers and modular protection devices
Technical Data Architecture

Thermal-Magnetic Calibration & Ambient De-rating Matrix

Standard MCB tripping curves rely on bimetal strip deflection caused by Joule heating ($I^2R$). When distribution boards in Phnom Penh operate in non-air-conditioned electrical risers, borey garage panels, or outdoor IP65 solar enclosures, the ambient baseline temperature alters the trip curve. Zhejiang TMB Electric addresses this by implementing precision bimetallic strips and arc chute de-ionization chambers capable of maintaining selective trip thresholds across severe temperature gradients.

Rated Current ($I_n$) 30°C (Standard IEC Base) 35°C (Indoor Air-con) 40°C (Standard Enclosure) 45°C (Industrial Plant) 50°C (Rooftop / Unventilated) 55°C (Extreme Sealed IP65)
6 A 6.00 A 5.88 A 5.70 A 5.52 A 5.30 A 5.10 A
10 A 10.00 A 9.80 A 9.50 A 9.20 A 8.90 A 8.50 A
16 A 16.00 A 15.68 A 15.20 A 14.72 A 14.24 A 13.60 A
20 A 20.00 A 19.60 A 19.00 A 18.40 A 17.80 A 17.00 A
32 A 32.00 A 31.36 A 30.40 A 29.44 A 28.48 A 27.20 A
40 A 40.00 A 39.20 A 38.00 A 36.80 A 35.60 A 34.00 A
63 A 63.00 A 61.74 A 59.85 A 57.96 A 56.07 A 53.55 A

Engineering Tip for Cambodian Contractors: When sizing main incomers and multi-circuit sub-panels for Borey estates (such as Borey Peng Huoth or Chip Mong projects), an ambient correction factor of $k_t = 0.90$ to $0.85$ should be factored into thermal load calculations to ensure uninterrupted continuous service without nuisance tripping during peak dry season temperatures.

Localized Deployment

Key Application Scenarios Across Greater Phnom Penh

How our modular protection ecosystem solves specific electrical, infrastructural, and environmental challenges encountered across Cambodian commercial real estate, manufacturing, and energy projects.

High-Density Borey Gated Communities

Modern luxury residential estates across Khan Chbar Ampov and Sen Sok feature large multi-split inverter air-conditioning networks. Inductive startup currents require robust C-curve MCBs calibrated to withstand motor inrush without degrading. Paired with our digital Over & Under Voltage Protectors, high-end consumer appliances are shielded against frequent EDC grid sags and neutral line floating faults.

Factory Automation & Garment Manufacturing

Textile mills and garment facilities along National Road 4 and Veng Sreng Boulevard run continuous sewing and cutting lines where electrical downtime equals severe financial penalties. Our 4P Dual Power Automatic Transfer Switches (ATS) paired with TOB1-63H breakers ensure sub-50ms failover switching between primary EDC grid supply and facility diesel backup generators, preventing complete factory blackouts.

Commercial Rooftop Solar Photovoltaic Installations

Cambodia’s renewable targets and electricity tariff structure have sparked heavy rooftop solar adoption across manufacturing plants and commercial malls. Direct current (DC) string protection requires arc-quenching chambers with permanent magnetic blowout channels. Our 2P 1000V DC MCBs and DC Molded Case Circuit Breakers (MCCBs) handle extreme open-circuit voltages without catastrophic arcing.

PV Combiner Box and Breaker Assembly Line
Cambodia Market Intelligence

Market Trends: Sourcing Shifts Among Phnom Penh Electrical Contractors

Over the past decade, electrical wholesalers situated in key trading zones like Wat Phnom electrical hardware wholesale alleys, Toul Tompoung commercial outlets, and industrial suppliers along National Road 3 have transitioned from uncertified gray-market components toward strict CE-marked and third-party verified apparatus.

  • Transition from 4.5kA to 6kA/10kA Breaking Capacity: As the Phnom Penh electrical grid expands with high-capacity substations, available short-circuit fault currents ($I_{sc}$) have increased dramatically. Professional panel builders now mandate minimum 6kA, and frequently 10kA, certified breaking capacities for commercial mains.
  • Integration of IoT & Smart Metering: Modern mixed-use developments increasingly specify smart breakers with Tuya/EasyCon app integration and pulse energy metering to automate rental tenant billing and remote load shed routines.
  • Strict Climate-Proofing: High atmospheric humidity during the rainy monsoon season prompts electrical contractors to source switchgear housed in flame-retardant VO-rated polyamide plastics with anti-corrosion silver-plated terminal clamps.

Zhejiang TMB Electric directly services this demand, providing container-load factory direct shipments via Sihanoukville Autonomous Port (PAS) and Phnom Penh Autonomous Port (PPAP) with full customs documentation, CE certificates, and factory test records.

Factory Direct Strength

Why B2B Wholesalers & EPCs Partner with Zhejiang TMB Electric

Located in Liushi, Wenzhou—the low-voltage electrical capital of China—we bring 24 years of manufacturing mastery directly to Cambodian distributors.

TÜV Rheinland Assessed

Our 5,700 m² production base undergoes rigorous on-site assessment by TÜV Rheinland, validating production capacity, testing apparatus, and workforce standards.

24 Years Specialization

Over two decades of pure focus on low-voltage switchgear. We control tooling, silver-nickel contact manufacturing, stamping, and automated assembly in-house.

Flexible OEM & Private Label

We support Phnom Penh distributors with custom brand laser printing, bespoke carton packaging, multilingual technical datasheets, and tailor-made tripping curves.

Low Risk Trial MOQ (From 5 pcs)

Lowering barriers to trade: test our sample batches with an ultra-low trial order quantity before scaling into full LCL or FCL ocean container shipments.

B2B Procurement Intelligence

Frequently Asked Questions by Cambodian Importers & Engineers

Essential technical, logistics, and compliance queries answered for Phnom Penh mechanical, electrical, and plumbing (MEP) professionals.

What breaking capacity (Icn/Icu) should be specified for Phnom Penh building projects?
For residential sub-circuits (branch lighting and standard socket outlets in shophouses and Borey homes), 4.5kA or 6kA rated MCBs (such as our TOB1-63H series) meet basic residential codes. However, for commercial high-rises in BKK1 or industrial installations in PPSEZ situated close to heavy transformer substations (22kV step-down to 400V/230V), prospective fault currents are substantially higher. In these applications, MEP consultants typically specify 6kA minimum for final branch circuits and 10kA MCBs or DC/AC Molded Case Circuit Breakers (MCCBs) for secondary distribution boards to ensure dynamic electrodynamic withstand without contact welding.
How does Cambodia's high ambient temperature affect the thermal trip characteristic?
MCBs are calibrated according to IEC 60898-1 at a base reference temperature of 30°C. In Phnom Penh, distribution boards exposed to direct solar heat on rooftops or unconditioned service ducts frequently reach 45°C to 55°C. At 50°C, a 20A rated breaker has an effective thermal carrying capacity of approximately 17.8A. If this derating factor (approx. 0.89) is not accounted for during circuit design, continuous current drawing near full load will cause premature thermal tripping. We supply full thermal-magnetic compensation tables and can custom-calibrate bimetallic strips for warm-climate specifications upon OEM request.
Why is an AC miniature circuit breaker unsafe for solar photovoltaic strings in Cambodia?
Alternating current (AC) naturally crosses zero voltage 100 times per second (at 50Hz), enabling the arc between contacts to extinguish swiftly during a trip. Direct current (DC) produced by solar PV strings has constant voltage with no natural zero crossing. If an AC breaker is installed on a DC circuit, opening under load generates a persistent electric arc that damages the contact assembly and risks ignition. Zhejiang TMB Electric supplies true 2P DC MCBs (up to 1000V DC) engineered with internal permanent magnets that stretch the arc magnetically into a deep de-ionization plate stack to quench high-voltage DC faults safely.
What are the logistics routes and shipping times from Liushi, Wenzhou to Phnom Penh?
Shipments depart from Ningbo Port or Shanghai Port (both highly accessible from our Liushi, Wenzhou facility). For ocean freight, cargo can be routed directly to Sihanoukville Autonomous Port (PAS) via weekly direct feeder vessels (transit time: 7 to 10 days) or via river feeder barge to Phnom Penh Autonomous Port (PPAP) on the Mekong River. Total door-to-door transit time for full container loads (FCL) or consolidated less-than-container loads (LCL), including export customs clearance, typically averages 14 to 18 days. Urgent prototype samples ship via air express (DHL/FedEx) arriving in Phnom Penh within 3 to 5 business days.
Does Zhejiang TMB Electric provide OEM private labeling for Cambodian electrical brands?
Yes. We possess comprehensive OEM and ODM production capabilities for Cambodian electrical trading houses, wholesalers, and major EPC groups. We offer high-resolution laser marking of your brand logo, customized model numbers, custom-designed inner carton packaging, and customized master carton markings with Khmer and English compliance text. Our engineering team also accommodates customized terminal screw types and front-face color toggles for private labeling projects.
How should an Automatic Transfer Switch (ATS) be configured for EDC grid vs. generator backup?
In Cambodia, commercial installations frequently deploy 4-Pole (4P) ATS units rather than 3-Pole (3P) units. A 4P transfer switch breaks both the three active phases and the neutral conductor simultaneously. This prevents unwanted ground-fault loop currents and neutral voltage displacement between the EDC grid transformer neutral and the floating or separately grounded standby diesel generator neutral, protecting sensitive IT servers and office electronics from destructive voltage surges during supply changeovers.
What certificates and verification reports accompany orders for Cambodian customs clearance?
Every shipment is supported by complete documentation required for smooth clearance through the General Department of Customs and Excise of Cambodia (GDCE). This includes our Factory Assessment Report issued on-site by TÜV Rheinland, CE Declaration of Conformity (DoC), IEC test certificates, detailed Commercial Invoices, Packing Lists, and Certificate of Origin (Form E or General CO) to allow importers to take advantage of preferential tariff frameworks.
Can your smart Bluetooth and WiFi DIN-rail switches operate stably with Phnom Penh telecom networks?
Yes. Our smart switch lines (such as the TOS6-40, TOS7-B, and TOB9e-63M series) utilize standard 2.4GHz IEEE 802.11b/g/n WiFi and Bluetooth BLE protocols compatible with all major Cambodian telecommunications providers (Smart Axiata, Cellcard, Metfone). The devices interface directly with globally supported smart home platforms like Tuya Smart and EasyCon, offering both localized off-line Bluetooth scheduling (which continues executing even during internet outages) and remote mobile control over 4G/5G mobile data.

Expand Your Electrical Wholesale Portfolio in Phnom Penh

Direct manufacturer pricing, verified CE quality, and flexible OEM solutions. Speak with our technical sales engineers today to receive comprehensive product catalogs, sample units, and wholesale container price lists.

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