The GDCR7 DC contactor relay series is designed for high-power DC switching circuits where reliable isolation, compact installation and protected contacts are required. The series covers rated current options up to 500A. The detailed parameters below use the 250A version as an example, with 12VDC to 1000VDC operational voltage, sealed construction and PWM coil control.
Key Features
- High-current DC switching platform with rated current coverage up to 500A.
- The 250A version is rated for 12VDC to 1000VDC operational voltage.
- Fully sealed epoxy resin structure to help protect contacts and coil from oxidation and external environmental influence.
- DC high-voltage non-polarity design for convenient installation and reliable breaking performance.
- PWM coil control technology to reduce coil power during holding operation.
- Components are listed as meeting current EU RoHS environmental requirements.
Model Code Reference
| Code section | Meaning |
|---|
| GDCR | DC contactor |
| 7 | Design number |
| Rated current code | Rated current code in the model number; the example version below uses 250 for 250A |
| B / NI | Rated operational voltage: B for 12VDC to 200VDC; NI for 12VDC to 1000VDC |
| H / C / Z / blank | Auxiliary contact type: normally open, normally closed, changeover, or without auxiliary contact |
| P | Coil type, Us 12/24VDC |
| W / blank | Horizontal mounting or vertical mounting |
| Custom code | Customer-specific code when special requirements are defined |
Contact Parameters for 250A Example Version
| Item | Specification |
|---|
| Rated operational current Ie | 250A |
| Rated operational voltage Ue | 12VDC to 1000VDC |
| Minimum load | 1A, 12VDC |
| Main contact type | 1SH, SPST normally open, double-make |
| Nominal resistance of main circuit | 0.2 mΩ at 250A |
| Main contact mounting | M8 external thread |
| Connecting torque | 10 to 12 N·m |
| Maximum switching current | 2500A at 320VDC, more than one cycle |
| Auxiliary contact maximum current | 30VDC 2A; 125VAC 3A |
| Auxiliary contact minimum current | 8VDC 100mA |
| Auxiliary contact resistance | Less than 0.15Ω |
Coil Parameters
| Item | Specification |
|---|
| Rated voltage Us | 12/24VDC |
| Operational voltage range | 8VDC to 36VDC |
| Pick-up voltage | 7VDC to 8VDC |
| Release voltage | 5VDC to 6VDC |
| Coil power | Holding: 2W |
| Inrush current | 3A for 0.1s at 12V |
| Holding current | 0.17A at 12V; 0.085A at 24V |
| Close time at Us | Not more than 45ms |
| Release time at Us | Not more than 10ms |
| Bounce time at Us | Not more than 5ms |
Electrical Characteristics
| Item | Specification |
|---|
| Dielectric withstand voltage | DC3110V; AC2200V |
| Insulation resistance | Not less than 1000MΩ at 1000VDC |
| Nominal insulation voltage Ui | 1000V |
Environmental Data
| Item | Specification |
|---|
| Shock stability test | 196 m/s², 20G |
| Shock strength test | 490 m/s², 50G |
| Vibration resistance | 10Hz to 2000Hz, 20G |
| Operating ambient temperature | -40°C to +85°C |
| Operating ambient humidity | 5% to 85% RH |
| IP grade | IP67 inner space |
| Altitude | Not more than 4000 m |
Life and Installation Notes
| Item | Specification |
|---|
| Mechanical life | 300,000 cycles |
| Resistive load life | Listed as dependent on next-page data for L/R not more than 1ms |
| Capacitive load life | 450A, 50,000 cycles, RC = 1ms, connected only |
| Weight | 104 g |
| External conductor cross-sectional area | Not less than 6 mm² |
For capacitive-load main-circuit charge and discharge control, the product data specifies that a pre-charge circuit should be added. Without a pre-charging path, transient high current at closing may cause contact sticking.
