CE / EN 60947
TOS6-40 Bluetooth Time Control Switch 35mm DIN Rail Wall-mounted Timing Countdown Loop Timing AC85-265V 40A Tomzn Official
40A Hybrid Load
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CE Certified Solar Disconnect Switch Exporter & Exporters
Technical Procurement Whitepaper & Verified Factory Directory for String Isolators, High-Voltage DC Circuit Breakers, and Smart Photovoltaic Safety Systems.
Direct Factory Showcase
Engineered PV Disconnect Switches & Integrated Automation Relays
Engineered for harsh solar thermal thresholds and high direct-current breaking cycles, every unit represents audited precision from Liushi Town, Wenzhou—China's low-voltage production capital.
IEC / CE Certified
TOMZN 1NO 1NC Din Rail Single Phase Weekly 7 Days Programmable Digital TIME SWITCH Relay Timer AC 220V 230V 12V 24V 48V 16A
Multi-Voltage 16A
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Smart Array I/O
TOMZN Bluetooth Smart Timer Switch 85-265VAC 10A 30A EasyCon Wall-mounted Countdown 28 Groups Timing Loop Timing
30A EasyCon App
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DIN-Rail Modular
TOMZN New Type Din Rail Single Phase Weekly 7 Days Programmable Digital TIME SWITCH Relay Timer AC 220V 230V 12V 24V 48V 16A
7-Day Dynamic Cycle
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IoT Switching
TOMZN TOS7-B Bluetooth Smart Timer Switch 40A 63A 85-265V EasyCon App Remote Control DIN Rail Countdown 28 Groups Timing Loop
63A High Ampere
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TÜV Assessed QA
TORT7 Series Delay-ON Delay-OFF 10in1 Asymmetric Cycler Time Relay Multi-function Timer Switch 0.1S-10D Pulse Generator Interval
10-in-1 Logic Relay
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DC 1000V PV Main
TMB 2P DC Disconnect Switch & Miniature Circuit Breaker 1000V DC 3-63A String Isolator for Photovoltaic Inverters
DC-PV2 Rated
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Heavy Industrial
TOM7Z Industrial Heavy-Duty 2P 1000V DC Molded Case Solar Disconnect Switch (DC MCCB) with Magnetic Arc Quench
Up to 250A Isolator
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Industrial Ecosystem
Why Global Solar EPCs & Wholesalers Source from Zhejiang TMB Electric
Operating within the heart of Liushi Town, Wenzhou—the globally recognized low-voltage manufacturing cluster—Zhejiang TMB Electric Co., Ltd. delivers direct-factory cost containment, audited metallurgical integrity, and engineering flexibility.
Liushi Supply Chain Density
Our 5,700 m² plant leverages a complete upstream ecosystem where pure silver alloy contacts, DMC flame-retardant housings, and specialized magnetic arc runners are refined within a 5 km radius. This gives our B2B partners unrivaled supply chain agility, negligible tooling setup costs, and ultra-fast lead times on customized switchgear configurations.
TÜV Rheinland On-Site Verification
Unlike trading intermediaries, Zhejiang TMB Electric operates with full operational transparency. Our workforce of 92 skilled technicians, semi-automated assembly bays, and dielectric impulse testing labs are strictly verified on-site by TÜV Rheinland. We maintain an audited ISO 9001 quality framework covering every phase from raw coil inspection to ultimate high-voltage breakdown calibration.
Flexible Low-MOQ (From 5 Pcs) & Full OEM
We eliminate market-entry barriers for regional solar wholesalers and engineering contractors. Most baseline disconnect switch catalog items support agile trial minimums starting from just 5 pieces. Concurrently, our engineering department provides deep OEM/ODM white-label printing, laser-engraved single-line diagrams, tailored enclosure knockouts, and custom DC voltage/current threshold builds.
Engineering Deep-Dive
Technological Evolution & Arc Physics in Modern DC Isolation
Understanding why conventional AC switching fails under solar direct-current dynamics and how advanced isolator engineering prevents catastrophic thermal runaway in 1000V–1500V PV installations.
The Physics of DC Arc Dissipation
Alternating current (AC) naturally crosses a zero-voltage threshold 100 or 120 times per second, extinguishing electrical arcs effortlessly as contacts open. Direct current (DC) generated by photovoltaic strings provides constant voltage without natural zero-crossings. When a solar disconnect switch opens under load, the ionizing air channel forms an intense continuous plasma arc reaching temperatures above 5000 K.
CE-certified solar disconnect switches manufactured by Zhejiang TMB Electric utilize high-velocity knife-blade contacts coupled with permanent rare-earth magnetic blowouts. The magnetic flux stretches the arc outward into a multi-plate de-ionizing arc chute, splitting and chilling the plasma channel in under 3 milliseconds, preventing switch degradation and enclosure breach.
Shift Towards 1500V Architecture & DC-PV2 Utilization
As large-scale commercial and industrial rooftop projects transition from 600V/1000V arrays to 1500V string topologies to reduce balance-of-system (BOS) cabling copper losses, disconnect switches encounter extreme dielectric strain. Modern disconnect switches must comply with rigorous IEC/EN 60947-3 DC-PV2 utilization categories.
DC-PV2 requires the switch to safely make and break highly inductive circuit conditions representing 4 times the rated operational current (4x Ie). Our engineering incorporates high-tracking-index (CTI > 600V) thermosetting polyesters and multi-pole series wiring schemes, distributing 1500V across four distinct contact chambers to minimize terminal operating heat.
Smart Remote Rapid Shutdown Integration (PVRSS)
The global regulatory push—spearheaded by NEC 690.12 mandates and evolving European building safety standards—has accelerated the adoption of automated, motor-driven, or shunt-release solar disconnectors. Passive mechanical rotary switches are progressively evolving into hybrid electronic isolators linked to building fire alarms, rapid-shutdown transmitters, and IoT energy meters.
By blending Bluetooth low-energy telemetry, DIN-rail intelligent timing relays, and automated transfer actuators into our disconnect line, TMB Electric enables PV systems to automatically isolate strings at the array perimeter within 30 seconds of grid disruption, safeguarding first responders from live DC conductors.
Procurement Intelligence
Strategic Sourcing Trends for Solar Disconnect Switches (2025–2030)
How utility developers, EPC engineering leads, and electrical equipment importers must structure their procurement specifications to prevent supply bottlenecks and regulatory non-compliance.
Demand for Factory Pre-Wired Modular Combiners
Skilled on-site electrical labor costs across North America and Europe have surged by over 40% in recent cycles. As a result, EPCs are shifting procurement away from discrete loose disconnect switches toward pre-wired, IP65/IP66 weatherproof solar combiner assemblies. Purchasing integrated solutions containing factory-torqued disconnect switches, Type II surge arresters, and gPV fuses dramatically reduces field wiring errors and commissioning timelines.
Verification of Third-Party Factory Audits
Self-declared CE declarations from unverified suppliers are increasingly scrutinized or detained by EU and UK customs authorites. Sourcing professionals now require verifiable Factory Inspection Reports (FIR) and on-site supplier verification from internationally accredited bodies like TÜV Rheinland. Prioritizing manufacturers with verified floorspace and dedicated testing infrastructure protects importers from liability and recall exposure.
Hybrid Storage (BESS) Disconnection Compatibility
Solar systems are no longer isolated from battery energy storage systems (BESS). Disconnect switch procurement must now account for bidirectional fault currents originating from low-impedance lithium battery banks. Modern disconnect specifications demand bi-directional arc-extinction chambers that prevent switch latching or melting regardless of current polarity, a critical feature engineered into our high-amperage 600V–1000V DC range.
| System Architecture | Recommended Isolator Type | Operational Voltage (Ue) | Key Technical Parameters | Typical Failure if Misapplied |
|---|---|---|---|---|
| Residential String (1-2 Strings) | Compact DIN Rotary Disconnector / 2P DC MCB | 500V – 800V DC | DC-PV2 Rated, 16A–32A, Lockable OFF | Dielectric carbonization from slow manual contact speed |
| Commercial Solar Array (3-8 Strings) | IP65 Pre-Wired Combiner with Load Break Switch | 1000V DC | Magnetic arc quenching, 32A–63A per channel | Enclosure melting from thermal accumulation |
| Utility String Inverter Input | Heavy-Duty DC MCCB Disconnect Switch | 1000V – 1500V DC | 100A–250A continuous, CTI > 600V housing | Flashover between poles during high-temperature ambient noon |
| DC Battery Bank Storage Coupling | Non-Polarized High-Amperage Disconnector | 48V – 600V DC | 80A–125A, Bidirectional magnetic runners | Explosion caused by reverse current magnetic field cancellation |
| Grid/PV Hybrid Backup System | Motorized ATS / Programmable Timer Isolator | 230V / 400V AC + DC Bus | Uninterrupted auto-transfer, 63A–125A | Neutral floating or phase collision during unsynchronized transfer |
Direct Sourcing FAQ
Frequently Asked Questions by Global Switchgear Importers
Direct technical answers addressing dielectric safety, customs compliance, wiring polarity, and OEM manufacturing agreements.
What distinguishes a true CE-certified solar disconnect switch from an AC isolator repurposed for DC?
True CE-certified DC disconnect switches are evaluated strictly under IEC/EN 60947-3 (Low-voltage switchgear and controlgear - Switches, disconnectors, switch-disconnectors and fuse-combination units). Re-purposed AC isolators depend on natural sine-wave current zero-crossing to dissipate the arc. Under DC conditions, opening an AC switch sustains an uninterrupted plasma arc that welds contacts or ignites the casing. A purpose-built DC disconnector incorporates permanent magnetic blowout fields, spring-driven knife contacts with microsecond snap actions independent of human handle velocity, and multi-segmented de-ionizing arc plates.
How does ambient rooftop temperature impact the selection of DC disconnect switches?
Rooftop combiner boxes and outdoor enclosures frequently endure interior temperatures exceeding 55°C to 65°C under direct solar irradiation. Disconnect switches experience internal thermal derating as ambient temperature rises. When specifying equipment, engineers must consult the thermal derating curves provided by our technical department. For example, a disconnector rated at 32A at 40°C typically requires derating to approximately 26A–27A when operated inside an enclosed IP65 cabinet at 60°C. Selecting switches with high silver-content terminals and DMC heat-deflecting housings prevents dangerous terminal overheating.
What is the difference between polarized and non-polarized DC disconnect switches?
Polarized DC disconnectors use permanent magnets arranged to blow the electric arc in one specific direction into the arc chute based on intended current flow (+ to -). If wired in reverse (a common hazard during battery charging/discharging or complex array re-combinings), the magnetic field deflects the arc away from the chute toward the switch mechanism, causing explosive failure. Non-polarized DC switches engineer dual-directional arc chambers or high-clearance contact splits that extinguish arcs effectively irrespective of current direction, making them crucial for battery storage applications.
What documentation and certifications are provided for containerized B2B export shipments?
Every shipment from Zhejiang TMB Electric Co., Ltd. is backed by CE Declarations of Conformity, RoHS compliance test certificates, standard factory routine test reports (insulation resistance, mechanical operation, and temperature-rise verification), and our TÜV Rheinland On-Site Supplier Assessment Report. Custom commercial invoices, Certificates of Origin (Form E, CO, etc.), and customs HS classification manifests (typically HS 8536.50 for low-voltage switches) are delivered systematically to ensure smooth clearance across European, Middle Eastern, Latin American, and Southeast Asian ports.
What are the capabilities and lead times for OEM private-label branding and custom box layouts?
Because our production lines are based in Liushi Town, Wenzhou, we offer extremely agile OEM customization. We provide laser-marked private label branding, customized carton packaging, specific color-coded switch levers, customized knockouts for cable glands or MC4 connectors, and pre-wired internal configurations combining disconnect switches with ATS relays or surge protective devices. Standard catalog trial orders ship within 3–7 business days; full container-load OEM production runs typically finalize within 15–25 days from drawing sign-off.
Accelerate Your Solar Switchgear Supply Chain Today
Whether you need baseline factory samples (from 5 pcs), tailored OEM solar combiner assemblies, or full technical datasheets with third-party test reports, our Liushi engineering team is ready to evaluate your bill of materials.
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