GYW3 DC air circuit breakers are used in high-current DC distribution systems where reliable isolation, fault interruption and equipment protection are required. The series covers GYW3-2500 and GYW3-4000 frame sizes, with multi-pole DC voltage configurations and fixed or draw-out installation options.
Key Features
- Designed for DC circuit protection and switching in high-current distribution applications.
- Arc-extinguishing chamber and contact-system design support high breaking capacity.
- Optimized contact structure and operating mechanism for improved electrical life and mechanical reliability.
- High-strength insulating material is used for impact strength and insulation performance.
- Compact phase spacing and built-in shunt help reduce complete cabinet size.
- Safety devices include draw-out door interlock, three-position locking device, OFF-position key lock, terminal shield and closing-ready device.
Model Range
| Model | Rated current | Poles in series | Rated working voltage |
|---|
| GYW3-2500 | 800A, 1000A, 1250A, 1600A, 2000A, 2500A | 2P, 3P, 4P | DC500V / DC750V for 2P or 3P; DC1000V / DC1500V for 4P |
| GYW3-4000 | 1600A, 2000A, 2500A, 3200A, 3600A, 4000A | 3P, 4P | DC500V / DC750V for 3P; DC1000V / DC1500V for 4P |
Breaking Capacity
| Model | DC voltage and pole configuration | Rated ultimate short-circuit breaking capacity |
|---|
| GYW3-2500 | DC500V, 2P | 50kA |
| GYW3-2500 | DC500V, 3P | 65kA |
| GYW3-2500 | DC750V, 2P | 40kA |
| GYW3-2500 | DC750V, 3P | 55kA |
| GYW3-2500 | DC1000V, 4P | 50kA |
| GYW3-2500 | DC1500V, 4P | 40kA |
| GYW3-4000 S/H | DC500V, 3P | 80kA / 120kA |
| GYW3-4000 S/H | DC750V, 3P | 65kA / 80kA |
| GYW3-4000 S/H | DC1000V, 4P | 55kA / 75kA |
| GYW3-4000 S/H | DC1500V, 4P | 50kA / 60kA |
Installation And Control
- Installation options include fixed and draw-out types.
- Controller options listed in the technical data include NWK20Z and NWK22Z controllers.
- Rated service short-circuit breaking capacity is listed as 100% of Icu.
- Rated short-time withstand current for 1 second is listed as 100% of Icu.
