IP65\ IP66\ IP67\ IP68
BSUMWELL/ OEM
$1 - $9
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| HA-4 Industrial Outdoor Waterproof Dustproof PVC Junction Distribution Control Box for Photovoltaic Switch | |||||||||
Premium Weatherproof Polymer FormulationMeticulously molded from premium-grade, impact-resistant PVC and ABS plastics, this HA-4 distribution box offers superior structural integrity under harsh environmental stress. The material features advanced UV-stabilizers that prevent cracking, fading, and brittle degradation caused by prolonged solar exposure in open-air photovoltaic installations.
Advanced IP65 Water and Dust IsolationEngineered with a high-resilience, continuous polyurethane sealing gasket and a secure click-lock transparent cover, this control box achieves an authenticated IP65 protection rating. It provides an airtight seal that completely blocks high-pressure water splashes, heavy rainfall, humidity, and micro-particulate dust from damaging internal electrical components.
Designed for Solar Photovoltaic & Industrial SafetyThis 4-way enclosure is purpose-built to house miniature circuit breakers (MCBs), surge protective devices (SPDs), and solar PV isolation switches. It features an integrated 35mm DIN rail for swift component mounting, built-in neutral and ground terminal blocks, and excellent flame-retardant properties to mitigate fire hazards and electrical thermal runaways.
Ergonomic Transparent Window & Installation UtilityThe box is designed with a flip-up, transparent tinted PC window that permits operators to inspect switch positions and circuit breaker statuses safely without exposing the internal wiring to the outer atmosphere. Pre-molded, easy-to-knock-out cable entry ports ensure neat, damage-free wiring glands installation for quick field wiring.










Q1: Is this HA-4 distribution box specifically optimized for outdoor solar PV systems?A1: Yes. The HA-4 enclosure is engineered specifically to serve as a combiner or switch box for outdoor solar photovoltaic installations. Its high UV resistance prevents material degradation under direct sunlight, and its IP65 ingress protection safeguards solar DC circuit breakers or isolators against rain, dew, and ambient moisture.
Q2: What is the maximum capacity of circuit breakers this box can accommodate?A2: The HA-4 model features an integrated standard 35mm DIN rail that can comfortably accommodate up to 4 standard single-pole miniature circuit breakers (MCBs) or a combination of double-pole breakers, RCBOs, or surge protectors depending on your specific circuit configuration.
Q3: How does the PVC/ABS material compare to metal enclosures in coastal environments?A3: Unlike metal enclosures that are highly susceptible to rust and salt-spray oxidation over time, this high-grade PVC/ABS plastic box is 100% corrosion-proof. It offers absolute resistance to chemical vapors, salt-spray coastal air, and acidic rain, making it a much longer-lasting and cost-effective solution for maritime or highly corrosive industrial sites.
Q4: Does the enclosure come with pre-drilled cable entry holes?A4: The enclosure comes with precision-engineered, pre-molded knockouts on both the top and bottom surfaces. These allow technicians to easily remove the exact sized ports needed for PG or metric waterproof cable glands during installation, ensuring a tight, uncompromised seal without the need for manual drilling tools.

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Q1: What makes this ABS enclosure suitable for direct burial or underground applications compared to standard PVC?
A1: High-grade ABS provides significantly higher impact resistance, tensile strength, and structural rigidity than standard PVC. This allows the enclosure to withstand the constant soil pressure, gravel shifting, and freeze-thaw cycles common in underground environments without cracking or deforming, while naturally resisting underground moisture, fungi, and soil chemicals.
Q2: How does the cable sealing system maintain its IP68 rating under high hydrostatic pressure?
A2: The enclosure utilizes a combination of compression-fit silicone gaskets along the lid and specialized mechanical cable glands at the entry points. When the glands are tightened, they compress a internal rubber seal uniformly around the cable jacket, preventing water tracking even when the unit is submerged or subjected to rising groundwater levels.
Q3: Can these plastic enclosures safely operate in industrial areas requiring explosion-proof specifications?
A3: Yes. The enclosure is engineered with high-density, flame-retardant ABS material that mitigates the risk of static build-up and surface arc ignition. Its robust wall thickness and secure fastening mechanism are designed to prevent external gases or dust from contacting internal electrical sparks, making it ideal for zone-classified dust or non-mining volatile environments.
Q4: Are these boxes resistant to prolonged sunlight if used above ground before transitioning underground?
A4: While standard ABS can degrade under prolonged UV exposure, our industrial-grade enclosures are manufactured with integrated UV-stabilizing compounds. This advanced formulation prevents the plastic from becoming brittle, fading, or cracking when exposed to direct sunlight in outdoor, above-ground installations.
Q1. Can I request samples of waterproof aluminum enclosures before bulk ordering?
A: Absolutely. We encourage sample orders for quality validation and even accept mixed samples. While standard samples are provided free of charge for qualified clients, custom samples may incur a nominal fee that will be credited toward future orders.
Q2. What is your production lead time?
A: Our streamlined process ensures:
Samples: 3-5 working days (expedited service available)
Mass production: 1-2 weeks for orders exceeding 1,000 units
Note: Lead times may vary for complex customization projects.
Q3. Is there a minimum order quantity (MOQ) for waterproof enclosures?
A: We prioritize flexibility for our partners:
Sampling: MOQ 1 unit for quality verification
Bulk orders: Competitive MOQ starting at 500 units, with tiered pricing for volume orders
Q4. What shipping methods do you offer for international orders?
A: We provide end-to-end logistics solutions:
Express: DHL/UPS/FedEx (3-5 days, door-to-door tracking)
Air freight: 5-7 days for urgent bulk shipments
Sea freight: Economical option for full-container loads (FCL)
Customs clearance support included for all shipments.
Q5. What is the standard ordering process?
A: Our 5-step streamlined workflow:
Technical consultation (application scenarios/IP rating requirements)
DFM analysis & formal quotation
Sample approval & 30% deposit payment
Production with weekly progress reports
Final inspection & balance payment
Q6. Can you apply custom branding to the products?
A: Yes, we offer value-added OEM services:
Logo engraving/pad printing (provide vector files in .ai/.eps format)
Custom packaging solutions
Design proof must be approved 72hrs before production commencement.
Q7. What quality assurance do you provide?
A: Our commitment includes:
Product warranty: 2-year limited warranty (extendable)
Certifications: IP68/IP69K compliant, RoHS & REACH certified
Testing reports: Third-party lab reports available upon request
Q8. How are quality issues handled?
A: Our zero-defect protocol ensures:
Prevention: ISO 9001:2015 certified production with automated optical inspection
Resolution:
Single-unit defects: Replacement within 48hrs (NCR report provided)
Batch issues: Full root-cause analysis + 3 resolution proposals within 72hrs
Critical defects: On-site technical support available
Need More Details?
Contact our sales team at [Sales@bsumwell.com] for project-specific consultation.


