Product Introduction
The BSB C7-200A DC contactor is a high-performance, epoxy-sealed DC contactor rated for 200A continuous current, built to handle high inrush conditions up to 2000A. With a compact footprint, non-polarity main contacts, and broad coil voltage support (12/24V or 48/72V), the C7-200A is ideal for demanding DC applications including electric vehicles, battery energy storage systems (BESS), and photovoltaic switching. Designed for long mechanical life and superior switching reliability, it is UL, CE, and TUV certified.
Product Features
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High Current Handling: Rated for 200A continuous and up to 2000A switching at 320VDC.
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Ultra-Low Resistance: Just 0.2 mΩ contact resistance at full load ensures minimal heat buildup.
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Coil Flexibility: Supports both standard (12/24VDC) and high-voltage (48/72VDC) coil systems.
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Reinforced Terminals: M8 external threads with 10–12 N·m torque rating for high-load connections.
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Pre-charge Compatible: Ideal for use with pre-charge circuits in EV and BESS architectures.
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Vibration-Resistant Design: Rated for 20G shock and vibration, IP67-sealed enclosure.
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Auxiliary Contact Options: NO, NC, or changeover auxiliary contacts available.
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Certified: UL, CE, TUV, and RoHS compliant for global applications.
Typical Applications
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Battery protection and main relay in high-power electric vehicles
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DC load management in containerized energy storage systems
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Photovoltaic inverter and converter switching
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DC fast-charging stations
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High-current distribution systems in telecom, rail, or UPS systems
Summary of Technical Parameters
| Parameter | Value |
|---|---|
| Rated Current | 200A |
| Rated Voltage | 12–1000VDC |
| Max Switching Current | 2000A @ 320VDC |
| Main Contact Type | SPST-NO (1SH) |
| Contact Resistance | ≤0.2 mΩ |
| Coil Voltage Options | 12/24VDC or 48/72VDC |
| Operating Voltage Range | 8–36VDC or 32–95VDC |
| Dielectric Strength | AC 3000V |
| Insulation Resistance | ≥1000 MΩ @ 1000VDC |
| Mechanical Life | 300,000 cycles |
| Capacitive Load Life | 480A (RC=1ms), 50,000 cycles |
| Operating Temperature | -40°C to +85°C |
| Auxiliary Contact (Optional) | NO / NC / Changeover / None |
| External Conductor Area | ≥65 mm² |
| Weight | ~425g (430g with auxiliary contact) |
| IP Rating | IP67 |
Dimensional Drawing & Wiring Diagram
Vertical type with economizer
Horizontal type with economizer
FAQs About The BSBC7-200A DC Contactor
Q1: Does the C7-200A DC contactor have reverse surge protection?
A1: Only products equipped with a PWM economizer include a surge suppression circuit. If you choose a standard product without an economizer, you need to address the issue of counter-electromotive force (back EMF) from a design perspective.
Q2: What coil voltages are available?
A2: The product supports 12/24VDC and 48/72VDC coil configurations, allowing use across different systems.
Q3: What is the actual operating voltage range of the coil in products with an economizer?
A3: 12/24VDC version – 9–36VDC; 48/72VDC version – 32–95VDC.
Q4: Can it operate in harsh industrial or off-road environments?
A4: Absolutely. The product is IP67-rated and tested for 20G vibration resistance, suitable for EV, ESS, and rail.
Precautions for Use
Please read and follow the precautions below to ensure safe and reliable operation of the C7-200A high voltage DC contactor:
Mechanical Installation
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Use spring washers during installation to prevent screw loosening.
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Tighten installation screws within the specified torque range (2.5–3.5 N·m) to avoid casing damage.
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Do not use the contactor if it has been dropped or impacted.
Wiring and Polarity
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The main contact terminals and coil leads are non-polarized, allowing flexible and error-free wiring.
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Ensure the external wire terminal is in reliable contact with the main terminal.
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Avoid contamination from grease or debris, which may cause terminal overheating.
Coil Surge Protection
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If the product includes an economizer, it has a built-in reverse surge absorption circuit, and no external protector is required.
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For models without economizer, install a varistor or TVS diode rated at 1.5–2× coil voltage at the coil terminals.
⚠️ Do not use a diode, as it will reduce the contactor’s breaking capacity.
Environmental Considerations
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Ambient operating temperature: –40°C to +85°C
The internal sealed chamber is gas-filled. High temperatures accelerate gas diffusion and shorten the contactor’s lifespan. -
Do not install the contactor near strong magnetic fields (e.g., transformers, magnets) or heat-emitting objects (e.g., fuses, shunts).
If necessary, perform a temperature rise test to confirm safe operation.
Electrical Life and Circuit Protection
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The contactor has a defined switching life and may lose its ability to break current at end-of-life.
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Do not exceed the rated switching capacity or electrical lifespan.
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It is recommended to design the circuit so that power is cut off within 1 second in case of contactor failure.
Load Conditions
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For resistive loads, apply the rated contact values directly.
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For inductive loads (L/R > 1ms), connect a parallel surge suppression device (e.g., TVS or varistor) across the load.
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For capacitive loads, a pre-charge circuit must be used to avoid high inrush currents and contact welding.
Coil Drive and Switching Behavior
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When the coil and main contact are repeatedly energized and de-energized, coil temperature may rise, increasing resistance and closing voltage.
In such cases, take one or more of the following actions:-
Reduce load current
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Limit the duration of continuous energization
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Use a coil voltage higher than the rated pull-in voltage
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The coil drive circuit must supply more power than the rated coil consumption, or the contactor’s breaking ability may decline.
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For models with energy-saving circuit, the coil transitions to holding mode approximately 0.1 seconds after power-on.
Do not attempt to switch off at that moment, as it may damage the internal coil.