IJ Instruments supplies the Corseener CSN series of high-voltage DC relays — rated up to 1500Vdc and 800A — engineered for EV DC charging piles, battery energy storage systems, wind power converters and heavy-duty electric vehicles. Built with an explosion-proof pressure-relief structure and dual-sealing technology for safe, long-life DC switching.
A high-voltage DC relay — also called a DC contactor — is an electromechanically operated switch used to make and break a high-voltage, high-current DC circuit. Unlike a signal-level relay, a high-voltage DC contactor has to safely extinguish the DC arc that forms across its contacts every time it switches a loaded circuit — DC arcs don't self-extinguish at a zero-crossing the way AC arcs do, which makes contact design, arc-quenching chamber volume and sealing far more critical than in an AC contactor of the same current rating.
This makes high-voltage DC relays a core safety component in any system where a large DC battery, capacitor bank or charging circuit needs to be reliably connected and disconnected — EV traction battery packs, DC fast-charging piles, battery energy storage systems (BESS), solar inverters and industrial DC bus applications.
Corseener ("柯希纳") is a China-based contactor manufacturer built around a PhD engineering team with over 20 years of combined industry experience, operating an integrated production chain that covers product R&D, mould manufacturing, component production, automated final assembly and inline testing under one roof. IJ Instruments is a dealer and reliable sourcing partner for Corseener high-voltage DC relays in India, helping engineers evaluate the right frame size and configuration before you commit to a design — with free technical consultation throughout.
Engineering Differentiators
Field failures in high-voltage DC contactors typically trace back to a handful of root causes — internal overpressure, seal degradation, insufficient dielectric clearance at higher voltages, and contact welding. Corseener's CSN series is engineered specifically around these four failure modes.
When internal gas pressure inside the sealed contact chamber reaches a threshold — from arc energy or a fault condition — a purpose-built relief structure vents pressure quickly, similar to a pressure-cooker relief valve, rather than allowing the housing to rupture.
Addresses: explosion/fire risk from contactor failure under fault conditions.
A high-temperature seal ring forms the primary seal between the terminal and frame, with epoxy potting as a secondary seal — giving the sealed chamber two independent seal barriers instead of relying on a single epoxy joint.
Addresses: single-epoxy-seal aging, cracking, gas leakage and shortened product life common in simpler designs.
Combines a ceramic arc chamber — which tolerates high-temperature arcing without degrading — with epoxy potting for the rest of the assembly, keeping manufacturing cost reasonable while avoiding the softening/sticking that copper terminals can suffer after high-temperature brazing. The result is a larger arc-quenching volume and wider contact gap at the same overall size, supporting the higher voltage classes (1000V–1500V) and higher currents that fast-charging and large-scale storage systems increasingly need.
Addresses: the trade-off between arc-chamber performance and manufacturing cost/complexity.
A restructured contact surface increases the effective contact area while reducing the localized area where welding (sticking) can occur — substantially reducing weld strength if it does occur, and largely eliminating the failure-to-disconnect risk that contact welding causes in a DC circuit.
Addresses: contact welding under high inrush or fault current, which can leave a DC circuit unable to disconnect.
Product Range
Eight frame sizes cover 10A to 800A across the 1000Vdc and 1500Vdc classes. Share your load current, voltage and coil preference, and we'll recommend the right frame and configuration.
| Frame | Rated Current | Voltage Class | Coil Options | Approx. Weight |
|---|---|---|---|---|
| CSN01 | 10A – 50A | 1000Vdc | Single coil 12V / 24Vdc | ~104g |
| CSN02 | 100A – 150A | 1000Vdc | Single coil 12V / 24V / 48Vdc | ~160–360g |
| CSN03 | 150A – 400A | 1000Vdc | Single coil or wide-voltage PWM 12–36Vdc | ~400–900g |
| CSN04 | 400A – 600A | 1000Vdc | Wide-voltage PWM 12–36Vdc | ~900g |
| CSN10 | 20A – 40A | 1500Vdc | Single coil 12V / 24Vdc, QC/PCB terminals | ~156g |
| CSN13 | 200A – 400A | 1000Vdc | Single coil or wide-voltage PWM | ~400g |
| CSN14 | 200A – 400A | 1500Vdc | Single coil or wide-voltage PWM | ~400–600g |
| CSN15 | 350A – 600A | 1500Vdc | Wide-voltage PWM 12–36Vdc | ~1100g |
Where It's Used
Main circuit switching for electric vehicle traction batteries and DC fast-charging stations.
Battery disconnect switching for industrial and commercial energy storage systems and inverters.
DC-side switching in wind power conversion and storage systems.
Battery main switching for heavy trucks, commercial and engineering vehicles.
High-voltage DC switching in marine electrical and hybrid propulsion systems.
DC battery backup switching for telecom and 5G infrastructure power systems.
Why IJ Instruments
Share your voltage class, continuous and peak current, coil voltage and mounting constraint — we'll help you select the right frame and configuration.
As a dealer for Corseener in India, we help you access this engineered DC contactor range without the hassle of sourcing directly overseas.
Datasheets, dimensional drawings and certification documents to support your design and procurement process.
Coordinated sourcing and delivery to OEMs, panel builders and system integrators across India.
FAQs
The terms are largely used interchangeably for high-current DC switching devices; "contactor" is more common for the higher-current, higher-voltage components used in EV, energy storage and industrial applications like the CSN series, while "relay" is sometimes reserved for lower-current signal or control-level switching.
AC current crosses zero twice per cycle, which helps extinguish the switching arc naturally. DC current doesn't cross zero, so a DC-rated contactor needs a larger arc-quenching chamber, wider contact gap and different contact materials to safely break a loaded DC circuit — using an AC-rated device on a DC circuit can lead to sustained arcing and contact damage.
It depends on your continuous current, inrush/peak current, voltage class and available mounting space. Share these details with us for a free technical consultation and frame recommendation.
The CSN series is rated for -40°C to +85°C operation and up to 4000m altitude, making it suitable for most outdoor EV charging and telecom infrastructure installations — confirm your specific site conditions with us during consultation.
IJ Instruments is a dealer and reliable sourcing partner for Corseener high-voltage DC relays in India, helping customers with product selection, technical consultation and sourcing support.
Share your voltage, current and coil requirement for a free technical consultation.