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200kW CNWINNEX Positive-Pressure (pxb) Explosion-Proof Resistive Load Bank · ATEX CertifiedThe CNWINNEX 200KW positive-pressure explosion-proof load bank is a canopy-type resistive load testing unit built around positive-pressure (pxb) explosion protection. Rated at 400Vac, 50Hz, three-phase four-wire (3P4W) with a power factor of 1.0, the unit achieves 1kW fine staging through 10 resistive load stages. Weighing only 220kg and fitted with 4 heavy-duty castors, it can be relocated and deployed flexibly in equipment rooms, workshops and outdoor sites, making it an ideal load verification tool for 200kW-class generator sets, UPS systems, energy storage systems and data centre equipment in hazardous areas.- Pressurized Explosion-proof Resistive Load Bank 500KWThe CNWINNEX 500KW Pressurized explosion-proof load bank is a high-power resistive load testing unit designed specifically for explosive hazardous areas. Rated at 400Vac, 50Hz, three-phase four-wire (3P4W) with a power factor of 1.0, it delivers high-precision and repeatable on-load testing for generator sets, UPS systems, power grids and energy storage systems. Built with a containerized structure and side-discharge airflow design, and equipped with a Siemens SIMATIC S7-200 SMART PLC and HMI touch screen, the unit supports both local and remote (Modbus TCP) control modes, combining industrial-grade durability with flexible deployment.
CNWINNEX BT35-11-11.2 Explosion-Proof Stainless Steel Axial Fan: 67,892 m³/h High-Volume Airflow for Centralized Ventilation Power in Large Hazardous SpacesIn large refinery process areas, hazardous-material storage warehouses, and onshore terminals of offshore platforms, the central contradiction in ventilation systems is often not whether explosion-proof certification exists, but whether sufficient air volume can be moved through the hazardous area per unit of time. When spatial scale rises to thousands of square meters, ceiling heights exceed ten meters, or duct routes cross multiple fire compartments, the air-change rate that conventional small and medium fan sizes achieve only through multiple parallel units can be delivered by a single high-volume unit—reducing installation nodes, and with them, the explosion-proof interfaces and maintenance touchpoints at every node.
CNWINNEX BT35-11-6.3 Explosion-Proof Stainless Steel Axial Fan: 18,250 m³/h Medium-High Airflow for Reliable Ventilation Boundaries in Corrosive Hazardous WorkshopsIn the routine ventilation design of chemical workshops, hazardous-material warehouses, and oil and gas stations, equipment selection often faces an implicit contradiction: explosion-proof compliance answers whether a fan can be used at all, but the corrosion degradation of impellers and casings in carbon steel or aluminum alloy units under humid, mildly corrosive, or sulfur-bearing atmospheres steadily erodes the boundary of how long it remains usable. A fan that runs safely in a Zone 1 area for three years may still require premature replacement because pitting on the blades throws off dynamic balance and reduces airflow—a problem that explosion-proof certification alone does not address, but that material and process engineering must answer.
The CNWINNEX BT35-11-6.3 Explosion-Proof Stainless Steel Axial Fan is designed for precisely this contradiction: stainless steel casing and impeller confront corrosive gases and humid environments, ATEX Directive 2014/34/EU and EN 60079 series
CNWINNEX BT35-11-3.15 Explosion-Proof Stainless Steel Axial Fan: ATEX-Compliant High-Efficiency, Low-Noise VentilationIn the explosive hazardous areas of petrochemical plants, oil and gas stations, hazardous-material storage facilities, and offshore platforms, ventilation equipment is not merely a process accessory—it is a foundational line of defense for the working environment. Conventional fans often struggle to reconcile material durability with explosion-proof reliability when faced with high salt spray, corrosive gases, and explosive atmospheres. The CNWINNEX BT35-11-3.15 Explosion-Proof Stainless Steel Axial Fan is engineered precisely for the ventilation demands of Zone 1 and Zone 2 high-risk environments. The product addresses corrosion challenges through stainless steel construction, establishes its explosion-proof baseline on ATEX and EN 60079 series standards, and balances 3,076 m³/h airflow with low-noise operation within a compact frame.
CNWINNEX Explosion-Proof Compressor: Full Coverage of 9 Refrigerants and Precise Pressure Control for Uncompromised Safety BoundariesIn hazardous-area explosion-proof refrigeration systems, refrigerant selection is often dictated by a project's regional environmental regulations, thermal control requirements, and system design. As the "heart" of the system, a compressor's ability to be compatible with multiple refrigerants while maintaining absolute safety control under various pressure conditions is a key indicator of engineering maturity in explosion-proof equipment.
CNWINNEX EX-ART2 2-Cylinder Explosion-Proof Compressor: Compact Architecture and Robust Parameters for Precise Cooling in Confined Hazardous SpacesIn offshore platform analyzer rooms, small explosion-proof control cabins, or space-constrained electrical equipment rooms, explosion-proof HVAC equipment faces strict physical size limits and exceptionally high safety compliance requirements. As China’s only independently IECEx-certified explosion-proof compressor company, CNWINNEX’s affiliated company introduces the EX-ART2 series 2-cylinder explosion-proof compressors—engineered specifically for these "space-premium and high-risk" working conditions.
Centered on static positive-pressure protection (pxb) and integrated with an increased-safety junction box and intrinsically safe protection components, the series carries the marking Ex eb ib mb pxb IIC T4 Gb. Through a compact 2-cylinder structure and two size matrices, it provides a solid, compliant refrigeration heart for cooling capacity requirements ranging from 3.39kW to 11.2kW.- CNWINNEX EX-ART4 Explosion-Proof Compressor: A Modular Matrix and Wide-Voltage Range Customized for Global Hazardous-Area Thermal ControlIn hazardous-area thermal control systems, a compressor must not only deliver sufficient cooling capacity but also guarantee absolute explosion-proof reliability. As China’s only independently IECEx-certified explosion-proof compressor company, CNWINNEX’s affiliated company introduces the EX-ART4 series 4-cylinder explosion-proof compressors. Centered on static positive-pressure protection (pxb) and integrated with increased safety (eb), intrinsic safety (ib), and encapsulation (mb), this series provides a rock-solid safety foundation alongside a highly modular model design and broad electrical parameter matrix—delivering a precisely matched, highly robust core for global explosion-proof HVAC systems.
200kW CNWINNEX Positive-Pressure (pxb) Explosion-Proof Resistive Load Bank · ATEX Certified
Product Overview
The CNWINNEX 200KW positive-pressure explosion-proof load bank is a canopy-type resistive load testing unit built around positive-pressure (pxb) explosion protection. Rated at 400Vac, 50Hz, three-phase four-wire (3P4W) with a power factor of 1.0, the unit achieves 1kW fine staging through 10 resistive load stages. Weighing only 220kg and fitted with 4 heavy-duty castors, it can be relocated and deployed flexibly in equipment rooms, workshops and outdoor sites, making it an ideal load verification tool for 200kW-class generator sets, UPS systems, energy storage systems and data centre equipment in hazardous areas.
The unit is ATEX certified and designed and manufactured in compliance with ATEX Directive 2014/34/EU and the EN 60079 series of explosion protection standards, carrying dual explosion-proof markings. For gas atmospheres: Ex db eb ib mb pxb ⅡC T4 Gb, where pxb denotes positive-pressure protection combined with flameproof (db), increased safety (eb), intrinsic safety (ib) and encapsulation (mb), with Equipment Protection Level Gb, suitable for Zone 1 and Zone 2, Group ⅡC explosive gas atmospheres, temperature class T4 (maximum surface temperature not exceeding 135℃). For dust atmospheres: Ex ib mb pxb tb ⅢC T130℃ Db, adding enclosure protection (tb) to the positive-pressure, intrinsic safety and encapsulation combination, with Equipment Protection Level Db, suitable for Zone 21 and Zone 22, Group ⅢC conductive dust atmospheres, with a maximum surface temperature not exceeding 130℃.
Core Features
Positive-pressure explosion protection: isolating hazardous atmospheres with clean pressurized air
The core concept of positive-pressure protection (pxb) is not to confront the explosive atmosphere directly, but to continuously supply clean protective gas into a sealed chamber so that the internal pressure always remains above the external environment. This physically prevents hazardous gas or dust from entering the enclosure, so that internal electrical components operate in a space free of explosive atmosphere. Before loading begins, the unit performs a pre-purge, replacing residual gas inside the chamber with a specified air volume and purge time. During operation, pressure switches and differential-pressure monitoring continuously track chamber pressure; if pressure falls below the set threshold, the system automatically alarms, unloads and cuts off the load, eliminating continued loading under lost pressure.
The pressurization system is integrated with the cooling system: the positive-pressure airflow simultaneously maintains chamber pressure and removes heat from the loading area, reducing additional gas consumption while preserving both explosion protection integrity and cooling efficiency. Loss of chamber pressure, fan stoppage or insufficient air pressure triggers the hardwired trip chain to cut the load directly; PLC monitoring does not replace this hardwired path. The combined protection forms further enhance safety redundancy: flameproof chambers contain internal ignition, increased-safety and intrinsically safe circuits limit spark energy, and encapsulation protects key electronic components, together building a complete protection system.
High-accuracy load testing
With a minimum load resolution of 1kW, the unit combines 10 load stages (1kW, 2kW, 2kW, 5kW, 10kW, 10kW, 20kW, 50kW, 50kW and 50kW) for continuously adjustable loading up to 200kW, with a load element tolerance of ≤±3%. A three-phase digital meter displays voltage, current, power, frequency and power factor in real time, while the control software provides a 0–110% loading slider and segmented loading settings for refined generator set and UPS performance verification.
Compact canopy structure, lightweight and mobile
The unit adopts a canopy-type structure with dimensions of 1195×1020×1100mm and a weight of only 220kg, fitted with 4 heavy-duty castors so a single operator can move it between sites. The floor-standing design suits both indoor and outdoor use, particularly space-constrained equipment rooms, test bays, on-site commissioning locations and temporary test stations at the edge of hazardous areas.
Industrial-grade resistive elements
The load core uses finned stainless-steel heating tubes with nickel-chromium (Ni-Cr) resistance cores rated to 1200℃, offering high temperature resistance, oxidation resistance and long service life. Resistive load branches use Schneider or Siemens contactors with fuse protection, ensuring reliability under continuous full-load and frequent switching duty. Load connection uses quick connectors (Powerlink 400A, for 90-120mm² copper conductors) for fast and reliable on-site connection, with the unit operating within -20℃ to +50℃.
Efficient cooling with redundant airflow paths
Nine 2.5kW three-phase fans with horizontal side airflow and redundant airflow paths provide 70m³/kW/h of airflow per kW of load, continuously removing heat from the loading area. The exhaust side uses 304 stainless steel louvers with stainless protective grilles for corrosion resistance, foreign-object protection and personnel safety. Fan operation with adequate air pressure is a prerequisite for load engagement, eliminating overheating from load application without airflow at the source.
Smart control system (local and remote)
Powered by a Siemens SIMATIC S7-200 SMART PLC, the unit performs loading, parameter setting and status monitoring locally via the HMI touch screen, displaying voltage, frequency, kVA, kW, power factor and per-phase L1/L2/L3 voltage and current in real time. Remote control is available via an RJ45 Ethernet port with host software using Modbus TCP. The 10 load-stage commands drive contactors through interposing relays and a common safety permission contact, with each stage auxiliary contact fed back to the PLC, forming a complete command–execute–feedback loop so that every loading action is traceable.
Six-layer safety protection and fail-safe trip chain
The unit is equipped with a hardwired fail-safe (normally closed) master load-trip chain: an open condition from fan overload, insufficient air pressure, chamber wall temperature reaching 120℃ or Emergency Stop immediately releases the master load enable and removes all load. PLC monitoring does not replace this hardwired trip path. Six protections are integrated: fan overload protection, fan low-airflow protection, thermal emergency cut-out, control circuit MCCB, local/remote control mode interlock and Emergency Stop. Any protective action automatically unloads and locks out loading, safeguarding both personnel and equipment.
Robust structure and customizable design
With IP54 protection for the complete enclosure and IP55 for the control chamber, a noise level of 85±3 dB(A), the structure is robust and customizable to customer voltage level, power capacity, connection method and test protocol. Each unit ships with free spare parts including interposing relays, fan motor protection relays, air pressure switches, Ni-Cr heating elements and indicator buttons to support long-term maintenance.
Main Technical Specifications
Table 1 Main technical specifications of the CNWINNEX 200KW positive-pressure explosion-proof load bank
Application Scenarios
For generator sets, the unit supports factory inspection, acceptance testing and maintenance load testing of 200kW-class diesel and gas generator sets, verifying output stability and protection operation at rated power. For UPS systems, it verifies full-load capability, transfer time and battery discharge characteristics. For power grids, it supports grid balancing and load regulation testing.
For data centres, it simulates server rack heat loads for equipment room cooling and airflow organization verification. For energy storage, it is suitable for BESS charge/discharge capability and grid-connection performance testing. Thanks to the high safety redundancy of positive-pressure protection, the unit can be deployed in oil and gas processing units, refinery areas, chemical reaction workshops, pharmaceutical solvent workshops and conductive-dust workshops classified as Zone 1/Zone 2 and Zone 21/Zone 22, providing a safe on-load means for power acceptance and periodic verification in hazardous areas.
Contact Us
The CNWINNEX 200KW positive-pressure explosion-proof load bank delivers flexible and reliable load testing capability for 200kW-class power equipment in hazardous areas through positive-pressure protection, 200kW pure resistive loading, 1kW fine staging, a lightweight 220kg enclosure and intelligent local/remote dual control. Contact the CNWINNEX engineering team for quotations, technical selection and customized solutions. Website: www.cnwinnex.com; Email: info@cnwinnex.com.
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