Fusesaver™ medium-voltage circuit breaker

15-27 kV
  • Rated short-time withstand current up to 6.3 kA

  • Rated continuous current up to 200 A

  • Lightning impulse (BIL) up to 125 kV

Fusesaver circuit breaker

As the world's fastest medium-voltage outdoor vacuum circuit breaker, Fusesaver circuit breaker reduces the impact of temporary faults on lateral lines. Its sub-cycle operating time and wireless communications help utilities increase network reliability while minimizing operating costs of overhead medium-voltage networks. 

 

Watch the videos below to learn more about Siemens Fusesaver medium-voltage circuit breaker.   

Application:

Saves fuses from blowing due to transient faults or completely replaces fuses. Cal Fire exempt for use in wildfire-prone regions.

 

Features include:

  • Sub-cycle breaking 
  • Self-powered from less than one ampere line current
  • Encrypted wireless communications
  • Multi-phase operation
  • Lightweight at 12 lbs.
  • Battery backup
  • Load breaking up to 200 A
  • Inrush restraint
  • Cold-load pickup.

Options:

  • Rechargeable battery
  • Conductor, crossarm, or pole mounting
  • SCADA connectivity with remote control unit.
Feature
Description
O-CO reclose sequence
The Fusesaver with O-CO functionality is capable of closing onto a fault, detecting the fault current and tripping again. Further, the Fusesaver with O-CO functionality runs protection even when a line is de-energized such that if a fault occurs it will trip with a single shot protection mode.
Normal and fast curves configurable for all protection operations
The Fusesaver with O-CO functionality maintains two fully configurable protection curves that can be applied to any protection trip. 
Protection mode control improvements
The user now has much greater configurability of protection functionality depending upon status of the external lever. Not only can the protection curve be changed, but also the protection sequence and the three phase lockout and pseudo three phase trip functions can be enabled or disabled. The protection sequence can be configured to OFF, single shot or O-CO and this can be changed via SCADA control if a remote control unit (RCU) is installed.
Thermal-overload protection
Provides self protection against excessive load current. Thermal-overload protection is always active.
Fault-passage indication functionality
When a Fusesaver trips to lockout on a permanent fault, the LED of the communications module will blink every three seconds for a user defined period of time up to seven hours. 
Radio-communications encryption
Encryption has been added to the peer-to-peer communications.
Increased battery capacity
The battery capacity in the communications module has been increased to improve service life.
Capacity charging configurability
The user can now configure whether the capacitor charge shall always default to the battery when a communications module is fitted. This increases the battery life on lines with extreme numbers of line-current off events.
-40 °F (-40 °C) operation
The Fusesaver with O-CO functionality low-temperature operating range has been extended to -40 °F (-40 °C).

Ratings:

  • Voltage ratings of 15 kV or 27 kV
  • Rated short-time withstand current of 4 kA or 6.3 kA
  • Rated continuous current of 100 A or 200 A
  • Lightning impulses (BIL) of 110 kV or 125 kV.
Feature
Unit
Data
Rated voltage
kV
15.5
27.6
Rated current
A
100
200
200
100
200
200
Partner fuse ratings
A
≤50
≤100
≤100
≤50
≤100
≤100
Rated short-circuit breaking current, symmetrical
kA
4
4
6.3
4
4
6.3
Rated short-circuit making current, peak
kA
10
10
16
10
10
16
Rated short-time current duration
s
0.2
1
0.5
0.2
1
0.5
Fault-break operations at 100%
-----
70
70
30
70
70
30
Minimum line current for operation
A
0.5
1.0
1.0
0.5
1.0
1.0
Rated lightning-impulse withstand voltage
kV
110
110
110
125
125
125
Minimum tripping current (configurable)
-----
0.5x fuse rating
Rated operating sequence
-----
O-2 s-CO/O-1 s-C
Mechanical operations
-----
2,000
Rated frequency
Hz
50/60
Weight
lbs/kg
12.1/5.5

Mailing address

Siemens Industry, Inc.

99 Bolton Sullivan Drive

Heber Springs, Arkansas 72543

United States