VS1(ZN63A)-12 Side-Mounted Indoor Vacuum Circuit Breaker | Reliable 12kV Power Protection | Chennuo Electric-Chennuo Electric Technology Group Co., Ltd

Parameter

Tech. parameters		Unit	Data
			20KA	25KA	31.5KA	40KA
Rated voltage		KV	12
Maximum working voltage		KV	12
Rated current		A	630-1250	630-1250	630-2000	1250-4000
Rated short circuit breaking current		KA	20	25	31.5	40
Rated short circuit making current		KA	50	63	80	100
Rated peak withstand current		KA	50	63	80	100
4S rated short circuit withstand current		KA	20	25	31.5	100
Rated insulation level	Power-frequency withstand voltage (rated before and after breaking)	KV	42(fracture 48)
	Lightning impulse withstand voltage (rated before and after breaking)		75(fracture 84)
Rated operating sequence			Break-0.3s-Make and break-180s-Make and break
Mechanical life		Times	20000
Rated short circuit breaking current breaking times		Times	50
Rated making voltage of operating machinery (DC)		V	AC/DC 110/220
Rated breaking voltage of operating machinery (DC)		V	AC/DC 110/220
Clearance between open contacts		mm	11±1
Overtravel (contact spring compression length)		mm	3.5±0.5
Breaking and making asynchronism of three different phases		ms	≤2
Contact closing bounce time		ms	≤2
Average opening speed		m/s	0.9-1.2
Average closing speed		m/s	0.5-0.8
Breaking time		ms	20-60
Making time		ms	≤70
Main circuit resistance of each phase		(μΩ)	630≤50 1250≤45	1600-2500≤40		3150≤35
Allowable cumulative wear thickness of dynamic and static contacts		mm	30

Environmental Conditions：

1. Ambient temperature is not greater than +40 °C, not less than 10 °C (allow storage at -30 °C);
2. Altitude below 1000m;
3. Daily average daily relative humidity of not more than 95%, the monthly average of not more than 90%;saturated vapor pressure daily average of not more than 2.2 10-3MPa, the monthly average of not less than 1.8*10-2MPa. When the temperature drops sharply, it may condense;
4. Earthquake intensity does not exceed 8;
5. No fire, explosion, serious pollution, chemical corrosion and severe vibration of the place.

Typical Application Scenarios:

Power Generation & Transmission Substations: Primary and secondary protection circuits in urban and rural power distribution networks.
Industrial & Mining Enterprises: Reliable power distribution, transformer protection, and heavy motor load switching for factories, steel mills, and chemical plants.
Renewable Energy Integration: Grid connection and protection for large-scale solar (PV) and wind power generation substations.
Commercial & Municipal Infrastructure: High-capacity power distribution systems for data centers, hospitals, airports, and municipal transit projects.

Why Choose Chennuo Electric?

Specialized Manufacturing Excellence: Decades of dedicated industry expertise in designing and manufacturing high and low-voltage power distribution equipment and switchgear components.
Strict International Quality Assurance: Every indoor vacuum circuit breaker undergoes rigorous factory testing—including high-voltage power-frequency withstand tests, lightning impulse tests, partial discharge measurement, and mechanical lifecycle checks—fully complying with IEC and international standards.
Flexible Customization: We offer tailored mounting dimensions, diverse control voltages, and bespoke mechanism designs to seamlessly fit your specific switchgear enclosure layouts.
Reliable Global Logistics & Support: Comprehensive export packaging (shock-absorbing, moisture-proof wooden crates) paired with prompt delivery tracking and expert technical engineering support.

Frequently Asked Questions (FAQ):

Q1: What voltage classes are available in your indoor vacuum circuit breaker series?
A: Our indoor VCB series covers comprehensive voltage ratings from 10kV, 24kV, and 35kV up to 110kV systems, accommodating various medium and high-voltage grid applications. Please check our product specification table or contact our sales team for precise model selection.

Q2: What is the difference between fixed-type and handcart (withdrawable) indoor VCBs?
A: Handcart-type VCBs are designed for modular switchgear (like KYN28) where the breaker can be easily racked in and out for maintenance and inspection without shutting down the entire busbar. Fixed-type VCBs are bolted directly into the cabinet structure, ideal for specific custom enclosure designs or stationary installations.

Q3: How do indoor vacuum circuit breakers handle short-circuit faults?
A: When a short-circuit fault occurs, the internal protection relays trigger the operating mechanism to pull the contacts apart in a high-vacuum chamber. The vacuum rapidly extinguishes the fault current arc within milliseconds, isolating the faulted section and protecting downstream equipment.

Q4: What routine maintenance is required for Chennuo indoor VCBs?
A: Thanks to the sealed vacuum interrupter design, internal contact maintenance is virtually eliminated. Routine servicing primarily involves periodic external cleaning, checking fastener tightness, lubricating mechanical moving parts, and testing insulation resistance and contact resistance per our technical manual guidelines.