Product Overview
The ZW32-24 is a three-phase AC 50Hz, 24kV outdoor high-voltage vacuum circuit breaker for breaking and making load currents and frequent operation, used in the construction and retrofit of urban, rural, mine and railway distribution networks. Miniaturised, maintenance-free and intelligentised, it is a green, pollution-free design. It complies with GB 1984-2003 and DL/T 402 ordering conditions and is offered in two ratings – 630A/20kA and 1250A/25kA – with an optional integrated isolating switch (G) that gives a visible break point for maintenance safety.
Product Display
Model Designation
Model format: ZW32-24 T 630/1250-20/25 (G)
- Z: Vacuum Circuit Breaker
- W: Outdoor Type
- 32: Design Sequence Number
- 24: Rated Voltage (kV)
- T: Spring Operating Mechanism
- 630 / 1250: Rated Current (A)
- 20 / 25: Rated Short-Circuit Breaking Current (kA)
- G (suffix option): With Integrated Isolating Switch
Service Conditions
- Ambient temperature: -40 degC to +40 degC
- Air relative humidity: daily average
- Altitude:
- Wind pressure:
- Air pollution degree: Grade IV (creepage-distance ratio >=31 mm/kV)
- Ice thickness:
- Site free from fire, explosion, severe pollution, chemical corrosion and violent vibration
Construction
The stainless-steel enclosure uses a zinc-rich anti-rust treatment and a UV-resistant clear coat for excellent corrosion and salt-fog resistance, while the APG solid-insulation poles are silicone-rubber encapsulated for compact size, strong anti-condensation performance and long maintenance-free life.
The spring operating mechanism (manual or electric, with optional remote-control and surge-avoidance closing) needs no more than 70 W of external supply and uses a buffer device for small rebound and low noise; the arc chamber is stainless-steel brazed and ceramic-metallisation sealed above 130 MPa in a single process, and the current transformer uses a soft-magnetic core with epoxy-resin and silicone double insulation for high accuracy and dynamic stability.
Technical Data
| Item | Unit | 630 A rating | 1250 A rating |
|---|---|---|---|
| Rated voltage | kV | 24 | 24 |
| Rated frequency | Hz | 50 | 50 |
| Rated current | A | 630 | 1250 |
| Rated short-circuit breaking current | kA | 20 | 25 |
| Rated peak withstand current (peak) | kA | 50 | 63 |
| Rated short-circuit making current (peak) | kA | 50 | 63 |
| Rated short-time withstand current / duration | kA/s | 20 / 4 | 25 / 4 |
| Rated operating sequence | – | O-0.3s-CO-180s-CO | O-0.3s-CO-180s-CO |
| Mechanical life | ops | 10000 | 10000 |
| Rated short-circuit breaking times | ops | 20 | 20 |
| Weight | kg | 115 | 115 |
| 1-min PF withstand (wet) ph-ph/earth/open contact | kV | 50 / 65 | 50 / 65 |
| 1-min PF withstand (dry) ph-ph/earth/open contact | kV | 65 / 79 | 65 / 79 |
| Secondary circuit 1-min PF withstand | kV | 2 | 2 |
| Lightning impulse withstand (peak) ph-ph/earth/open contact | kV | 125 / 145 | 125 / 145 |
Standards
The ZW32-24 complies with GB 1984-2003 (high-voltage alternating-current circuit-breakers) and DL/T 402-2007 / DL/T 402-2000 ordering technical conditions for 12kV-40.5kV high-voltage vacuum circuit breakers.
Installation & Dimensions
Installation Diagram
The ZW32-24 is pole-mounted outdoors in two frame versions: the standard ZW32-24/T and the ZW32-24G/T with an integrated isolating switch (taller body, wider terminal span). Maintain adequate clearance for switching and maintenance, and make all primary and secondary connections to local utility standards.
| Item | ZW32-24/T (mm) | ZW32-24G/T (mm) |
|---|---|---|
| Overall height | 970 | 930 |
| Overall base width (front view) | 1056 | 1280 |
| Adjacent pole spacing | 580 / 380 | 1056 |
| Side-view overall length | 510 | 980 |
| Mechanism box height | 315 | – |
| Lower frame height | 209 | – |
| Base mounting hole offset | 160 | 160 |