Product Introduction
The BSB C7-500A DC contactor is the highest current model in the C7 series, offering a 500A continuous current capacity and 2500A peak switching at 300VDC. Built with a sealed epoxy resin housing (IP67), the C7-500A provides superior arc suppression and stability in high-power DC environments. Designed for electric vehicles, energy storage, and PV systems, it features flexible coil voltage support (12/24VDC), reliable auxiliary contact options, and vibration resistance up to 20G.
Product Features
-
Extreme Current Support: Continuous 500A operation with max switching at 2500A and 300VDC.
-
Fully Sealed Epoxy Housing: Protects internal components from gas, dust, and moisture – rated IP67.
-
12/24VDC Coil Options: Wide operating voltage range (9–36VDC) with fast response times.
-
Robust Mechanical Life: Rated for 300,000 mechanical cycles with consistent electrical reliability.
-
High Shock & Vibration Resistance: Withstands 20G vibration and 50G impact for mobile and industrial use.
-
Auxiliary Contact Configuration: Optional NO or NC contact feedback for safety loop integration.
-
Massive Conductor Compatibility: External wiring must be ≥185 mm² for safe high-current operation.
Typical Applications
-
High-current main contactor in electric buses and heavy-duty EVs
-
Power switching and protection in utility-scale BESS systems
-
DC output control in PV inverter or charging station cabinets
-
Military-grade DC vehicles and marine energy platforms
-
Large-capacity DC rectifiers and converters
Summary of Technical Parameters
| Parameter | Value |
|---|---|
| Rated Current | 500A |
| Rated Voltage | 12–1000VDC |
| Max Switching Current | 2500A @ 300VDC |
| Main Contact Type | SPST-NO (1SH) |
| Contact Resistance | ≤50mV @ 100A |
| Auxiliary Contact Options | NO / NC / None |
| Coil Voltage Options | 12/24VDC |
| Operating Voltage Range | 9–36VDC |
| Holding Power | 3.2W |
| Inrush Current | 3.8A @ 12V (0.1s) |
| Capacitive Load Life | 600A (RC=1ms), 30,000 cycles |
| Dielectric Strength | AC 3000V |
| Insulation Resistance | ≥1000 MΩ @ 1000VDC |
| Mechanical Life | 300,000 cycles |
| Operating Temperature | -40°C to +85°C |
| Vibration Resistance | 10–2000Hz, 20G |
| Weight | 550g (555g with auxiliary) |
| External Conductor Area | ≥185 mm² |
| IP Rating | IP67 |
Dimensional Drawing & Wiring Diagram
FAQs About The BSBC7-500A DC Contactor
Q1: Does the C7-500A DC contactor have reverse surge protection?
A1: Yes, the C7-500A DC contactor has an integrated surge suppression circuit, so there’s no need to configure a varistor or TVS diode.
Q2: Is this contactor polarity-sensitive?
A2: No. Both main contact and coil leads are non-polarized, simplifying installation.
Q3: What is the recommended conductor size?
A3: Minimum 185 mm² conductor cross-section to handle 500A safely and prevent overheating.
Q4: Q: Does a capacitive load capacity of 600A mean its continuous current-carrying capability?
A4: No, 600A refers to the maximum inrush current the contactor can handle when connecting to a capacitive load. This specifically applies to the moment when the circuit is closed. When the contactor closes, a voltage difference across the contacts can cause a sudden surge of current. Without a pre-charge circuit to manage this surge, the contactor may stick or become damaged. Therefore, it is recommended to use a pre-charge circuit to avoid such issues.
