Precision-engineered 1P to 4P DIN-rail circuit breakers tailored for Singapore commercial & industrial electrical infrastructure.
Singapore stands as Southeast Asia’s premier hub for high-tech manufacturing, hyperscale data centers, petrochemical processing on Jurong Island, and hyper-efficient commercial architecture under the BCA Green Mark 2030 Super Low Energy (SLE) framework. Operating within a high-humidity tropical environment and backed by stringent regulations from the Energy Market Authority (EMA) and Singapore Standard SS 638 (formerly CP 5 Code of Practice for Electrical Installations), power distribution infrastructure demands uncompromising reliability, thermal endurance, and rapid arc suppression.
The OFKL-NXB Series Miniature Circuit Breaker (MCB) by Wenzhou OFA Electrical Technology Co., Ltd. is crafted specifically to meet these demanding localized conditions. Designed for seamless integration into distribution boards (DBs), main switchboards (MSBs), and consumer units across Singapore’s industrial hubs (such as Tuas Mega Port, Changi Business Park, and Tanjong Kling Data Center Parks), the OFKL-NXB series delivers reliable thermo-magnetic overload and short-circuit protection.
Achieving superior circuit protection requires advanced metallurgical formulation, optimized arc-chute geometry, and ultra-precise calibration of bimetallic trip mechanisms. The OFKL-NXB Series incorporates high-grade AgCdO/AgZnO silver alloy contacts that drastically lower contact resistance while eliminating contact welding during high-inrush current events.
Features a 12-plate arc-chute chamber constructed from de-ionizing steel grids. Upon contact separation under fault conditions, the electric arc is immediately driven into the splitter plates, cooling and extinguishing the fault within 3 to 5 milliseconds.
Precision calibrated inverse-time bimetallic strip provides dependable thermal protection against sustained overloads, while a high-speed electromagnetic solenoid triggers instant magnetic tripping during low-impedance short circuits.
Molded from high-impact, self-extinguishing PA66 engineering polymer (UL94 V-0 rated), resisting heat up to 960°C glow-wire test, critical for Singapore’s warm tropical ambient operating conditions.
| Technical Parameter | OFKL-NXB Specification / Capability | Singapore Market Standard Compliance |
|---|---|---|
| Number of Poles (P) | 1P, 2P, 3P, 4P, 1P+N, 3P+N | SS 638 / IEC 60898-1 |
| Rated Current ($I_n$) | 1A, 2A, 3A, 4A, 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, 63A | Compatible with standard DB sub-circuits |
| Rated Operational Voltage ($U_e$) | AC 230V/240V (1P), AC 400V/415V (2P-4P), 50/60Hz | Singapore Low-Voltage Grid Standard (230V/400V) |
| Short-Circuit Breaking Capacity ($I_{cn}$) | 6,000A (6kA) / 10,000A (10kA) | Certified for commercial & industrial MSB/DB applications |
| Tripping Characteristics | Type B (3-5 $I_n$), Type C (5-10 $I_n$), Type D (10-14 $I_n$) | B: Domestic/Lighting; C: General Commercial; D: High-Inrush Motors |
| Insulation Voltage ($U_i$) & Impulse ($U_{imp}$) | $U_i = 500\text{V}$, $U_{imp} = 4\text{kV}$ (1.2/50$\mu\text{s}$) | Resilient against lightning transient surges in tropical regions |
| Electrical / Mechanical Endurance | 10,000 operations (Electrical) / 20,000 operations (Mechanical) | Exceeds standard maintenance lifespan expectations |
| Ingress Protection & Mounting | IP20 (Terminals), IP40 (Enclosed panel), 35mm DIN Rail Mount | Fits standard Schneider, ABB, Eaton compatible DB enclosures |
The low-voltage circuit protection market is undergoing a structural transition driven by global decarbonization, the proliferation of distributed energy resources (DERs), electric vehicle charging infrastructure (EVSE), and smart microgrids. According to industry research, the demand for high-reliability DIN-rail circuit breakers in the Asia-Pacific region is expanding rapidly, with Singapore acting as the regional procurement hub for Southeast Asian infrastructure projects.
Singapore’s mandate for EV-ready buildings under Technical Reference TR 25 requires electrical panels to handle non-linear loads and DC residual currents. The OFKL-NXB series works in tandem with residual current operated circuit breakers (RCBOs/RCCBs) to prevent nuisance tripping caused by high-frequency inverter noise.
In tropical climates where ambient temperatures inside unconditioned switchboards can reach 55°C, standard MCBs suffer premature thermal tripping. OFKL-NXB series feature thermal compensation curves engineered to maintain rated capacity under severe thermal stress.
Engineering contractors in Singapore require fast turnaround times and customizable OEM configurations. Partnering directly with Wenzhou OFA Electrical Technology Co., Ltd. bridges the gap between premium international quality standards and cost-effective direct-factory supply chains.
The versatile OFKL-NXB product family is tailored for deployment across Singapore’s key economic sectors, providing engineered safety for critical assets:
Mission-critical server racks require 24/7 continuous uptime. OFKL-NXB 1P/2P 10kA curve C breakers provide fast isolation of localized branch circuit faults without tripping upstream Air Circuit Breakers (ACBs), ensuring zero cascading downtime.
Ideal for modular consumer units and main distribution boards in commercial towers across the Marina Bay Financial Centre and residential HDB upgrades, guaranteeing compliance with SS 638 safety mandates.
Featuring anti-corrosive housing and humidity-sealed internal springs, the OFKL-NXB series withstands corrosive airborne particulates and chemical vapors present in heavy industrial refining zones.
Rooted in Yueqing, Wenzhou—the capital of China's low-voltage electrical appliance industry—Wenzhou OFA Electrical Technology Co., Ltd. has established over a decade of technical leadership in distribution switchgear and control gear manufacturing.
Rated as a Tax Credit Grade A enterprise for seven consecutive years, demonstrating transparent financial management and corporate reliability for international procurement partners.
Every OFKL-NXB unit undergoes automated testing for instantaneous magnetic trip, thermal overload delay, dielectric breakdown strength, and mechanical switching operation prior to packaging.
Full capability to provide customized breaking capacities, special tripping curves, tailored laser-printed branding, and bespoke packaging for Singaporean EPC contractors and brand owners.
As power networks evolve toward digitalization, OFA Electrical Technology is driving innovation in smart circuit protection. The next stage of the OFKL-NXB platform introduces micro-sensor integration and smart communication modules:
Integration of Modbus-RTU and RS485 connectivity directly onto sub-distribution DIN-rails, enabling real-time current, voltage, and energy consumption telemetry streaming to cloud energy management systems (EMS).
Incorporation of integrated NTC thermistors and high-frequency arc detection algorithms to identify micro-arcing from loose terminal screws before electrical fires can start.
Transitioning to 100% recyclable thermoplastic housing and lead-free silver contact alloys in full alignment with EU RoHS 3.0 and Singapore NEA environmental guidelines.
Everything you need to know about procuring and installing the OFKL-NXB series circuit breakers in Singapore.
Get in touch with our engineering and sales team today for detailed technical datasheets, CAD drawings, sample requests, and competitive direct-factory pricing.
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