Medium Voltage Components: Product Families
Medium-voltage equipment operates above 1 kV, and most plant and distribution work sits between 2.4 and 38 kV. This group covers three component types. Vacuum circuit breakers interrupt current inside sealed vacuum bottles and are fitted to switchgear as drawout or fixed elements. Load interrupter switches open and close load current but are not meant to clear a fault, so they are usually paired with fuses. Power fuses protect transformers, capacitor banks and cables by clearing faults.
Each is described by rated voltage class, continuous current and interrupting rating, and the mounting or mechanism style has to match the lineup. Buyers therefore ask for the breaker or fuse series along with its ratings.
31 product families from 10 manufacturers
Vacuum Circuit Breakers
Siemens
GMSG (in GM-SG metal-clad switchgear)
Horizontal drawout ANSI vacuum breaker with the 3AH3 stored-energy operator, used in Siemens air-insulated metal-clad switchgear.
- Rated range
- Switchgear up to 27 kV; breakers up to 63 kA; up to 4,000 A (per Siemens selection guide ANSI-MV-AIS-SGSA-EN.pdf)
Siemens
GMSG-GCB
Drawout vacuum generator circuit breaker built to IEEE C37.013 for generator applications.
- Rated range
- Described for 10-80 MW machines; voltage and current not stated on the page
Siemens
SDV7 / SDV7-AR
Listed as current
Outdoor distribution vacuum circuit breaker in a weatherproof enclosure; SDV7-AR is the arc-resistant version.
- Rated range
- 15.5-38 kV; short-time withstand up to 40 kA; continuous up to 3,000 A; BIL up to 200 kV
Siemens
3AH3
Vacuum circuit breaker covering the common medium-voltage range, used in switchgear and generator or industrial duty.
- Rated range
- 7.2-36 kV; up to 6,300 A; short-circuit breaking up to 72 kA (catalog HG 11.03, 2010)
ABB
VD4 / VD4 evo (IEC)
Listed as current
General-purpose spring-mechanism vacuum circuit breaker for primary distribution; the evo version adds optional monitoring sensors. ABB points ANSI users to its ADVAC line.
- Rated range
- Up to 46 kV; up to 4,000 A; up to 63 kA
ABB
VM1
Vacuum circuit breaker with a linear magnetic actuator, mechanically interchangeable with VD4.
- Rated range
- Up to 24 kV; up to 3,150 A; up to 50 kA
ABB
VD4-AF / VD4-AF1
Servomotor-driven vacuum breaker for electric arc furnace transformer switching; AF1 adds inrush reduction.
- Rated range
- Up to 38 kV; up to 2,500 A (3,150 A fixed version); up to 31.5 kA (40 kA fixed version)
ABB
VD4G
Vacuum breaker for generator circuits, able to interrupt generator-fed faults with delayed current zeros.
- Rated range
- Up to 15 kV; up to 4,000 A; up to 63 kA system-fed
ABB
ADVAC (ANSI indoor)
Spring-mechanism drawout vacuum breaker designed to IEEE/ANSI standards, with the racking truck built in.
- Rated range
- 5, 8, 15 and 38 kV classes; 1,200-4,000 A; 25-63 kA
ABB (GE legacy)
PowerVac VB / VB1 (ML-17, ML-18 mechanisms)
Legacy
GE-origin metal-clad switchgear vacuum breaker line, now covered by ABB renewal-parts documentation.
- Rated range
- 5 kV, 7.2 kV and 15 kV systems; 250-1,000 MVA nominal
Schneider Electric (Square D)
VR (in Masterclad switchgear)
Horizontal drawout 3-cycle vacuum breaker for Masterclad air-insulated metal-clad switchgear.
- Rated range
- Breaker up to 27 kV; Masterclad up to 4,000 A at 15 kV and 2,000 A at 27 kV
Powell Industries
PowlVac (Power/Vac)
Vacuum breakers for Powell metal-clad switchgear; Powell acquired the Power/Vac line and builds both.
- Rated range
- 5 kV and 15 kV: 1,200-4,000 A, up to 63 kA (36 in. width); 27 kV design up to 40 kA; a 38 kV design also offered
Toshiba
VK type
Discontinued
Drawout motor-spring vacuum breaker built to IEC, JEC and ANSI C37.06.
- Rated range
- 12 kV; 630-3,150 A; 25, 40 or 50 kA
Toshiba
VZ type
Drawout motor-spring vacuum breaker, interchangeable with the VK type, built to JEC and IEC.
- Rated range
- 7.2 kV list: 600-4,000 A, 16-40 kA (a 12 kV list is also given on the page)
Mitsubishi Electric
VPR series
Vacuum circuit breaker series for switchgear, self-cooled up to 3,150 A and tested to IEC 62271-100.
- Rated range
- 3.6/7.2/12/15/24 kV classes; 600-3,150 A
Load Interrupter Switches
S&C Electric
Alduti-Rupter (indoor distribution)
Group-operated interrupter switch for line, transformer and cable switching, in three-pole and single-pole versions.
- Rated range
- Through 34.5 kV; 600 A or 1,200 A continuous and interrupting (600 A only at 25 and 34.5 kV)
S&C Electric
Alduti-Rupter (outdoor distribution)
Three-pole group-operated switch with no-external-arc interruption for overhead feeders and substations.
- Rated range
- 14.4-69 kV; 600-2,400 A continuous; up to 1,600 A interrupting
S&C Electric
Mini-Rupter
Compact three-pole group-operated interrupter switch for line, transformer and cable switching on underground distribution circuits.
- Rated range
- 4.16-27.6 kV; 600 A continuous; 400 or 600 A interrupting
S&C Electric
Omni-Rupter
Outdoor interrupter switch for transformer, cable and load-splitting duty in distribution sectionalizing.
- Rated range
- 14.4-17 kV and 25-29 kV at 900 A; 34.5-38 kV at 630 A (continuous and interrupting)
Siemens
SIMOSEC (ANSI)
Metal-enclosed load-interrupter switchgear with a gas-insulated switch, fused or unfused.
- Rated range
- Up to 27.6 kV; feeders up to 600 A unfused; 1,200 A main bus; fused short-circuit up to 63 kA at 15 kV and below
Siemens
SIEBREAK / SIEBREAK-VCB
Modular metal-enclosed interrupter switchgear (switch and fuses), with a fixed vacuum breaker added in the VCB version.
- Rated range
- SIEBREAK-VCB flyer: up to 15 kV, 2,000 A, 95 kV BIL
Schneider Electric (Square D)
HVL
Traditional metal-enclosed load interrupter and air-insulated switch with power fuses, UL listed to IEEE 37.20.3.
- Rated range
- Up to 1,200 A at 38 kV
Schneider Electric (Square D)
HVL/cc
Compact metal-enclosed load interrupter switchgear with power fuses, UL listed to IEEE 37.20.3.
- Rated range
- 38 kV; up to 1,200 A
Schneider Electric (Square D)
MiniBreak
Discontinued
Small load-break interrupter switch for short-circuit protection in tight installations.
- Rated range
- 5.5 kV; up to 200 A
Powell Industries
Metal-enclosed load interrupter switchgear
Fused or non-fused switch lineups for substation primary disconnect or circuit isolation, NEMA 1 and 3R.
- Rated range
- 5-38 kV
Power Fuses
S&C Electric
SMD-20 / SMD-40 power fuses
Outdoor station power fuses (SMU fuse units) for transformers, capacitor banks and cables.
- Rated range
- 14.4-34.5 kV; 200 A (SMD-20) and 400 A (SMD-40) continuous; interrupting up to 25,000 A at 14.4 kV (SMD-40)
S&C Electric
SM-4 / SM-5 power fuses (outdoor)
Outdoor distribution power fuses using SM refill units, in three speeds.
- Rated range
- 4.16-34.5 kV; SM-4 200 A, SM-5 300/400/720 A; interrupting up to 15,600 A (SM-4) and 34,000 A (SM-5)
S&C Electric
SM / SML power fuses (indoor)
Indoor distribution power fuses for transformers and cables; SML adds Uni-Rupter single-pole live switching.
- Rated range
- 4.16-34.5 kV; 200, 300, 400, 720 A; interrupting about 6,250-34,000 A at 60 Hz
Mersen
E-rated general purpose medium-voltage fuses
Current-limiting fuses for transformer and distribution line protection that ride through magnetizing inrush; ferrule, bolt-on and clip-lock styles.
- Rated range
- 2.75, 5.5, 7.2/8.25, 15.5, 25.8 and 38 kV classes
Mersen
R-rated back-up medium-voltage fuses
Current-limiting high-interrupting fuses for short-circuit protection of medium-voltage motors and starters.
- Rated range
- Ferrule 2.5/5/7.2 kV; bolt-on 5/7.2/15.5 kV; DIN 3.3/5.5/7.2 kV
Schneider Electric
Fusarc CF (with Solefuse, Tepefuse, MGK)
IEC-style medium-voltage fuse ranges (high-break, current-limiting, striker) for indoor and outdoor circuits.
- Rated range
- 3.6-36 kV
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Ratings and lifecycle notes come from the manufacturer pages linked on each entry.
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