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sir4 70kv/1700ma

The Alstom SIR4 70kV/1700mA is a vacuum circuit breaker specifically designed for railway traction power systems, providing reliable protection for AC electrified lines up to 70kV. This heavy-duty breaker combines advanced interrupting technology with railway-specific durability for mission-critical applications.

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Key Features
1. Superior Interrupting Performance

70kV rated voltage (84kV withstand)

1700mA continuous current capacity

25kA/31.5kA short-circuit breaking capability

<60ms opening time for critical faults

2. Railway-Optimized Design

Vacuum interrupters (maintenance-free operation)

Spring-operated mechanism with motor charging

EN 50123 & IEC 62271 compliant

Special anti-vibration construction (EN 61373)

3. Smart Monitoring & Control

Integrated condition monitoring sensors

Remote operation capability (SCADA compatible)

Local/remote switching options

LED status indicators

4. Environmental Resilience

-40°C to +55°C operating range

IP54 protection (outdoor version available)

Salt mist and pollution resistant

Technical Specifications
Parameter Specification
Rated Voltage 70kV (84kV withstand)
Rated Current 1700A continuous
Breaking Capacity 25kA/31.5kA (IEC 62271)
Mechanical Life 10,000 operations
Control Voltage 110VDC/220VDC
Weight ~250kg (depends on configuration)
Dimensions Standard railway cabinet mounting