PowerBond / SafeBond — 750/1500 V DC cubicles: feeder circuit breaker and bonding switch
750 and 1500 V DC cubicles that combine a feeder circuit breaker with a bonding switch connecting the overhead line to the negative busbar or earth. The PowerBond version is rated for breaker current up to 8000 A, and SafeBond occupies the Lightning cubicle footprint. For traction substations and sectioning posts.
- PowerBond
- 750/1500 V DC (900/1800 V), breaker 4000–8000 A, air-insulated, high-speed; EN 50123, IEC 61992; service life 40 years
- PowerBond: short-circuit current
- 125 kA / 180 kA peak (900 V); 100 kA / 142 kA peak (1800 V)
- PowerBond: endurance
- 20,000 (breaker), 10,000 (busbar selector)
- SafeBond
- NDC breaker + motorised two-position disconnector in the Lightning cubicle size; 750–1500 V DC; 125 kA / 180 kA peak
Price, availability and lead time on request. We help with analogue selection, customs clearance and delivery.
Description
In DC traction networks, for the safe work of personnel the overhead line or conductor rail on a section must be switched off and separately connected to the negative busbar or earth (bonding). There are two versions that combine the functions of a feeder circuit breaker and a bonding switch in one cubicle. This saves space, reduces civil works and cables, and improves safety.
PowerBond is an air-insulated high-speed DC cubicle with a magnetic actuator for railway networks. It supplies the contact system from a traction source or connects it to the negative or earth. It is intended for 750 and 1500 V systems, with both overhead line and third and fourth rail, and is compatible with many protection relays, including Mitre+. Parameters are to EN 50123-1/2/6 and IEC 61992-1/2/6. Design voltage 900/1800 V, insulation 1800/3000 V, impulse 18 kV. Breaker operating current 4000 A (line), 6000 A (rectifier) or 8000 A, positive busbar 6000 or 8000 A, negative 500 A.
Short-circuit current 125 kA / 180 kA peak (900 V) and 100 kA / 142 kA peak (1800 V), busbar withstand up to 125 kA 250 ms, track time constant 100/63 ms, critical current 50 A. Endurance 20,000 operations of the breaker and 10,000 of the busbar selector, service life 40 years. PowerBond has full approval for use across the whole Network Rail infrastructure.
SafeBond combines the function of a feeder circuit breaker and remote bonding in the standard Lightning cubicle size, 450 × 1526 mm. The NDC breaker with a magnetic actuator switches all load and short-circuit currents, and a motorised two-position off-load disconnector selects the circuit. In the plus position the cubicle works as a feeder circuit breaker, and in the minus position it connects the track feeder cable to the negative busbar. All operations are electrically interlocked, with local control or remote control from SCADA.
SafeBond rated voltage 750–1500 V DC, short-circuit current 180 kA peak / 125 kA – 142 kA peak / 100 kA, withstand 100 kA peak / 71 kA 250 ms, BS EN 50123, service life 30 years. Power frequency test voltage 9 kV, impulse 20 kV, temperature from −5 to +40 °C. Applications include traction substations and sectioning posts of railways and metro. The switchgear is manufactured in Blackwood (South Wales).
Technical specifications
| PowerBond | 750/1500 V DC (900/1800 V), breaker 4000–8000 A, air-insulated, high-speed; EN 50123, IEC 61992; service life 40 years |
|---|---|
| PowerBond: short-circuit current | 125 kA / 180 kA peak (900 V); 100 kA / 142 kA peak (1800 V) |
| PowerBond: endurance | 20,000 (breaker), 10,000 (busbar selector) |
| SafeBond | NDC breaker + motorised two-position disconnector in the Lightning cubicle size; 750–1500 V DC; 125 kA / 180 kA peak |
| SafeBond: insulation | power frequency 9 kV, impulse 20 kV; −5…+40 °C; BS EN 50123; service life 30 years |
| Approval | PowerBond approved by Network Rail |
Request a price and lead time
PowerBond / SafeBond — 750/1500 V DC cubicles: feeder circuit breaker and bonding switch. We reply within one business day.
Or email sales@usk.ua or call 044 339-50-20.
Questions and answers
What is the purpose of the PowerBond and SafeBond cubicles?
They combine in one cubicle a feeder circuit breaker and a bonding switch connecting the overhead line or rail to the negative busbar or earth (bonding). This saves space, cables and civil works.
What parameters does PowerBond have?
Design voltage 900/1800 V, breaker operating current 4000, 6000 or 8000 A. Endurance 20,000 operations of the breaker and 10,000 of the busbar selector, service life 40 years.
What size and standard does SafeBond have?
SafeBond is built in the standard Lightning cubicle size of 450 × 1526 mm for 750–1500 V DC to BS EN 50123. Service life 30 years.
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