Indoor load switches · 12 kV series

VZF-12 / VZFR-12Solid-sealed vacuum load switches

Front view of the VZFR-12 switch-fuse combination and operating panel. — Images show the VZFR-12 switch-fuse combination. Confirm the selected arrangement and cabinet fit against the approved order drawing.

Front and side view of the VZFR-12 switch-fuse combination on its withdrawable truck. — Images show the VZFR-12 switch-fuse combination. Confirm the selected arrangement and cabinet fit against the approved order drawing.

An indoor vacuum load-switch family for 12 kV distribution cabinets. Select the VZF-12 bare load switch or VZFR-12 switch-fuse combination, then specify the mechanism, control supply and cabinet interfaces for your order.

Rated voltage: 12 kV
Fuse rated current: 160 A
Fuse breaking current: 50 kA
Power-frequency / impulse withstand: 42 / 75 kV
Rated transfer current: 3,150 A
Electrical life: 10,000 operations

Ratings shown apply to VZFR-12/T160-50. Confirm the complete rating schedule for the bare VZF-12 switch and other combinations.

Review all ratings and service conditions

Discuss VZF / VZFR-12 selection Open product manual

VZF / VZFR-12 technical specifications.

Electrical ratings below apply to the VZFR-12/T160-50 switch-fuse combination. Confirm a separate rating schedule for the bare VZF-12 load switch or another combination before selecting the assembly.

Electrical ratings — VZFR-12/T160-50
No.	Item	Unit	Value
01	Rated voltage	kV	12
02	Power-frequency withstand voltage, phase-to-phase and phase-to-earth	kV	42
03	Lightning-impulse withstand voltage, phase-to-phase and phase-to-earth	kV	75
04	Fuse rated current	A	160
05	Fuse rated short-circuit breaking current	kA	50
06	Rated short-time withstand current	kA	—
07	Rated peak withstand current	kA	—
08	Rated short-circuit closing current	kA	—
09	Rated cable-charging breaking current	A	—
10	Rated transfer current	A	3150
11	No-load transformer switching capacity	kVA	1250
12	Electrical life	operations	10000
13	Partial discharge	pC	≤5

The 160 A current and 50 kA breaking capacity are fuse ratings. A dash means no applicable value is specified for this combination; it does not indicate zero capacity or a bare-switch rating.

Mechanical characteristics

Mechanical characteristics — VZFR-12
No.	Item	Unit	Value
01	Contact opening distance	mm	8–10
02	Contact-pressure spring travel	mm	3–5
03	Phase-center distance	mm	150 / 210 / 275
04	Three-phase closing/opening asynchronism	ms	≤2
05	Contact closing bounce	ms	≤3
06	Average closing speed	m/s	0.4–0.8
07	Average opening speed	m/s	1.0–1.4
08	Closing time at rated operating voltage	ms	≤60
09	Opening time at rated operating voltage	ms	≤30
10	Main-circuit resistance	µΩ	≤250
11	Moving/static contact wear allowance	mm	3

Operating mechanism

Spring mechanism and charging motor
No.	Item	Unit	Value
01	Closing interlock electromagnet Y1	VA/W	3
02	First shunt release Y2 — standard	VA/W	220
03	Closing release Y3 — standard	VA/W	220
04	Overcurrent releases Y7–Y9 — optional	VA/W	—
05	Undervoltage release Y4 — optional	VA/W	—
06	Truck interlock electromagnet Y0 — optional	VA/W	3
07	Spring-charging motor rated voltage	V	AC 220 / 110; DC 220 / 110
08	Spring-charging motor power	W	90
09	Spring-charging time	s	≤8

VA/W denotes AC apparent power or DC power. Optional overcurrent and undervoltage release ratings require confirmation. Select the mechanism supply and optional devices together with the final control circuit.

Service conditions

Normal service conditions
No.	Item	Unit	Value
01	Ambient temperature	°C	−25 to +40
02	Relative humidity, daily average	%	≤95
03	Relative humidity, monthly average	%	≤90
04	Saturated water-vapour pressure, daily average	MPa	≤2.2 × 10⁻³
05	Saturated water-vapour pressure, monthly average	MPa	≤1.8 × 10⁻³
06	Altitude	m	≤1500
07	Seismic intensity	degree	≤8
08	Location	—	No dripping water, fire or explosion hazard, chemically corrosive gas or severe vibration

Installations outside these conditions require an agreed specification.

Load switch and fuse-combination options.

Choose the bare load switch or switch-fuse combination first. Then specify the truck fit, fuse arrangement, operating supply and auxiliary circuits for the complete order.

VZF and VZFR assemblies

Assembly	Mechanical and primary fit	Control and interlocks
VZF-12 bare load switch	Confirm the truck, primary contacts, cabinet dimensions and clearances for the selected load-switch assembly.	Specify the spring mechanism, operating supply and auxiliary circuits. Confirm closing and truck interlocks on the approved schematic.
VZFR-12 switch-fuse combination	Withdrawable truck with solid-sealed poles and top-mounted fuses. Match the cabinet width, phase-centre spacing, pole spacing and fuse dimensions to the selected assembly.	Coordinate the fuse, striker and tripping arrangement. Check fuse-operation indication and the final control circuit against the approved schematic.

The detailed electrical ratings on this page cover VZFR-12/T160-50 only. Confirm separate ratings for a bare VZF-12 switch or another combination; fuse breaking ratings do not establish the bare switch’s short-circuit duty.

Cabinet and fuse fit: Cabinet width: 650 / 800 / 1,000 mm; the usual selection is 800 mm. Confirm the complete layout for the selected assembly.

Phase-centre spacing: 150 / 210 / 275 mm; usual 210 mm. Specify pole spacing separately: 275 / 310 mm, usual 275 mm.

Fuses, combination only: specify the coordinated type, rated current and breaking duty. The selection dimensions are a 360 mm core length and Ø45 mm end diameter; confirm the complete fuse and holder before ordering.
Mechanism and control supply: Mechanism: spring-operated, with a 90 W charging motor and charging time ≤8 s.

Supply: 110 or 220 V AC or DC; the usual voltage is 220 V. Confirm the actual control and motor supply with the final circuit.

Interlocks: anti-pumping is standard. Closing and truck locks are optional and are omitted from the standard selection.

Other options: extended truck handle, undervoltage release and program lock with 2 locks / 1 key or 3 locks / 2 keys. Confirm each required option in the order.

Auxiliary contacts

Circuit	Standard reservation
Auxiliary switch	4 NO + 4 NC
Energy-storage indication	2 NO + 1 NC

NO = normally open; NC = normally closed. Confirm the supplied contacts and terminal allocation against the approved wiring drawing.

VZFR-12 outline dimensions.

The side profile shows height and front-to-back clearances. Use the cabinet-width schedule with the complete front view when finalizing the cabinet layout.

Side-profile dimensions

Open full-size drawing

VZFR-12 switch-fuse combination side profile. Dimensions are in mm. Use the complete outline for front-view dimensions and operating-panel markings.

Open complete outline at PDF page 6

Cabinet-width dimensional schedule

VZFR-12 cabinet dimensions and weight
Cabinet width	P	A	B	C	E	Weight
650 mm	150 mm	500 mm	530 mm	490 mm	203 mm	120 kg
800 mm	210 mm	650 mm	680 mm	640 mm	278 mm	140 kg
1000 mm	275 mm	850 mm	880 mm	840 mm	378 mm	160 kg

P, A, B, C and E correspond to the lettered dimensions in the complete front view. Check the selected cabinet width and phase spacing together; these values do not establish dimensional compatibility for the bare VZF-12 switch.

Open dimensional schedule at PDF page 7

Confirm all interfaces on the approved order drawing. Cabinet layouts and secondary wiring require the project drawings; standalone CAD files are not included in these downloads.

VZF / VZFR-12 manual and selection form.

The manual covers the switch and fuse-combination assemblies. Use the selection form to specify cabinet dimensions and control requirements.

Available · PDF · 12 pages

VZF / VZFR-12 product manual

Family designations, VZFR-12 ratings, operating mechanism, service conditions and cabinet outlines. The detailed electrical rating example is VZFR-12/T160-50; confirm the complete order code before use.

Open manual PDF

Available · DOC · 1 page

VZF(R)-12 selection form

Specify the product branch, cabinet width, phase and pole spacing, fuse, operating supply, contacts and accessories. Confirm the model designation and rating schedule for the requested assembly.

Download selection form

Price & quotation.

Configuration · VZF-12 630 A

VZF-12 630 A vacuum load switch

Price reference for the specified VZF-12 630 A configuration. VZF-12 630 A configuration only. This is not the price of the VZFR-12/T160-50 fuse combination.

Rated voltage: 12 kV
Rated current: 630 A
Quoted model: VZF-12

Price range

USD 980–1000 / set

USD per complete three-phase set. Minimum order: 1 set. USD 1000 per set for 1–99 sets; USD 980 per set for 100+ sets. Shipping and taxes are excluded. Other configurations and accessories require a separate quotation. Confirm the specification and final quotation before ordering.

The range reflects order-quantity tiers for this configuration; it does not cover every option in the series.

Discuss VZF / VZFR-12 selection

Quantity pricing

Published quantity tiers for this configuration
Quantity (sets)	Price per set
1–99	USD 1000
100+	USD 980

Selection questions.

Answers about VZF-12 and VZFR-12 assemblies, cabinet fit, controls and product files.

01How do VZF-12 and VZFR-12 differ?

VZF-12 is the bare vacuum load switch; VZFR-12 is the load-switch/fuse combination. The product views show the VZFR-12 combination. Confirm the selected assembly in the configuration requirements.

02Does the 50 kA rating apply to a bare VZF-12 switch?

No. The 50 kA value is the fuse breaking rating for VZFR-12/T160-50. It does not establish bare-switch breaking or withstand duties. Confirm the complete rating schedule for any other assembly; see the electrical ratings and service conditions.

03How should I choose the cabinet width?

Specify cabinet width, phase-centre spacing and pole spacing together. Match the dimensional schedule and complete outline with the approved cabinet layout. Use the cabinet dimensions for the selected VZFR-12 combination.

04What should I specify for the control circuit?

State AC or DC and the operating voltage, then confirm the charging motor, optional releases, auxiliary contacts and locks with the final schematic. The usual operating voltage is 220 V. See the mechanism and control selections.

05How should fuse links be selected for a VZFR-12 combination?

Start with the transformer or circuit duty, system voltage and fault level. Select the fuse type and current rating together with its dimensions, striker and tripping interface. Coordinate the fuse characteristics with the protected circuit and the complete switch-fuse assembly. See the fuse and cabinet-fit requirements.

06Which details are required to specify the assembly?

Provide the complete product designation and rating duties, cabinet fit, fuse specification for a combination, operating supply, auxiliary contacts and interlocks. Prepare the configuration requirements and complete the selection form.

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