24KV Vacuum Interrupter Circuit Breaker

Model: TD445Z, TD445Y, TD424B, TD425B, TD425Y, TD445P

The 24KV Vacuum Interrupter Circuit Breaker is the core product of Sunway Hanguang, a professional manufacturer with over 50 years of experience in high-voltage electrical equipment. Adopting advanced high-vacuum arc-extinguishing technology, this product features excellent performance, reliability, green environmental protection and wide adaptability, complying with GB, IEC and ANSI standards. With stable operation in 40+ countries and cumulative delivery exceeding 80,000 units, it is a trusted choice for global customers. As a leading supplier, Sunway Hanguang is committed to providing high-quality products and comprehensive services.

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Product Description

Founded in 1968 in Xiaogan High-tech Zone, Hubei Province, China, Sunway Hanguang has focused on high-voltage electrical equipment for over 50 years. As a professional manufacturer integrating R&D, production, sales and service, it has a 40,000㎡ production factory, total assets of over 80 million yuan, a 16-person R&D team and an annual output of 350,000 units. It is one of the enterprises with the widest vacuum interrupter parameter coverage globally, laying a solid foundation for the stable supply of 24KV Vacuum Interrupter Circuit Breaker.

Product Overview & Core Parameters

The 24KV Vacuum Interrupter Circuit Breaker, Sunway Hanguang’s core product, is designed for medium and high-voltage power distribution with stable performance and high safety. Core parameters: rated voltage 24kV (max 25.8kV) for 50/60Hz systems; vacuum degree ≥1.33×10⁻³Pa, no SF₆ emission; compliant with GB/IEC/ANSI standards; annual export growth over 10%.

Product Parameter Table

ELECTRICAL RATINGS(3PHASE) SYMMETRICAL BASIS
Model NO.	VITD 24/2000-25Z	VITD 24/2000-25Y	VITD 24/1250-20B	VITD 24/1250-25B	VITD 24/1250-25Y	VITD 24/2000-25P
Rated Frequency	50/60Hz	50/60Hz	50/60Hz	50/60Hz	50/60Hz	50/60Hz
Rated Maximum Line to Line Voltage	24kV,r.m.s	24kV,r.m.s	24kV,r.m.s	24kV,r.m.s	24kV,r.m.s	24kV,r.m.s
Rated Power Frequency Withstand Voltage:Air	79kV,r.m.s	79kV,r.m.s	65/79kV,r.m.s	65kV,r.m.s	65/79kV,r.m.s	79kV,r.m.s
Rated Impulse Withstand Voltage:Air	125kV,Peak	1600kV,Peak	125/145kV,Peak	125kV,Peak	125/145kV,Peak	125kV,Peak
Rated Normal Current	2000A	2000A	1250A	1250A	1250A	2000A
Rated Short-Circuit Current (3Phase Symmetrical Basis)	25kA,r.m.s	25kA,r.m.s	20kA,r.m.s	25kA,r.m.s	25kA,r.m.s	25kA,r.m.s
Percentage D.C. Component of Rated S.C. Breaking Current	0.5	0.5	0.5	0.5	0.5	0.5
Rated Short-Circuit Making Current	63kA,Peak	63kA,Peak	50kA,Peak	63kA,Peak	63kA,Peak	63kA,Peak
Rated Duration of Short Time Current	4s	4s	4s	3s	4s	4s
Rated Short-Time Withstand Current	25kA,r.m.s	25kA,r.m.s	20kA,r.m.s	25kA,r.m.s	25kA,r.m.s	25kA,r.m.s
Rated Peak Withstand Current	63kA,r.m.s	63kA,r.m.s	50kA,r.m.s	63kA,r.m.s	63kA,r.m.s	63kA,r.m.s
Maximum Contact Resistance at Minimum Closing Force	18Micro ohms	18Micro ohms	18Micro ohms	18Micro ohms	18Micro ohms	18Micro ohms
Rated Breaking Current of Single Capacitor Bank	630A,r.m.s	630A,r.m.s	630A,r.m.s	400A,r.m.s	630A,r.m.s	630A,r.m.s
Rated Breaking Current of Back-to-Back Capacitor Bank	400A,r.m.s	400A,r.m.s	400A,r.m.s		400A,r.m.s	400A,r.m.s
Rated operating sequence	o-0.3s-co-180s-co	o-0.3s-co-180s-co	o-0.3s-co-180s-co		o-0.3s-co-180s-co	o-0.3s-co-180s-co
MECHANICAL DATA
Interrupter Weight(Approx.)	2.96kg	4.88kg	3.11kg	2.65kg	4.88kg	2.96kg
Moving Part Weight(Approx.)	1.1kg	1.4kg	1.08kg	1.2kg	1.38kg	1.1kg
Closing Force due to Bellow and Atmospheric	120±50N	120±50N	120±50N	15.9kgF	120±50N	120±50N
Force Required to Hold Contacts open at Full Stroke	190±60N	190±60N	190±60N		190±60N	190±60N
MECHANICAL REQUIREMENTS(REF. VCB)
Contact Stroke	13±1 mm	13±1 mm	13±1 mm	12±1 mm	13±1 mm	13±1 mm
Opening Speed(average of 75 contact gap)	1.5±0.2m/Sec	1.5±0.2m/Sec	1.5±0.2m/Sec	1.0-1.4m/Sec	1.5±0.2m/Sec	1.5±0.2m/Sec
Maximum Overtravel During Opening	2mm	2mm	2mm	2mm	2mm	2mm
Maximun Rebound During Opening	2mm	2mm	2mm	2mm	2mm	2mm
Closing Speed (average of last 30% contact gap)	0.9±0.2m/Sec	0.9±0.2m/Sec	0.9±0.2m/Sec	0.6-1.0m/Sec	0.9±0.2m/Sec	0.9±0.2m/Sec
Maximum Contact Bounse Duration(with maximum 2 bounces)	≤2ms	≤2ms	≤2ms	0.002Sec	≤2ms	≤2ms
Rated Contact Compressive Force	2500±200N	3150±200N	2000±200N	184-203kgF	2500±200N	2500±200N
Closing and Opening non-simultaneity of three-phase Contacts	≤2ms	≤2ms	≤2ms		≤2ms	≤2ms
LIFE (ESTIMATED)
Electrical Life at Rated Normal Current	50,000 Operations	50,000 Operations	50,000 Operations	50,000 Operations	50,000 Operations	50,000 Operations
Electrical Life at Rated Short Circuit Current	100 Operations	100 Operations	100 Operations	100 Operations	100 Operations	100 Operations
Mechanical Life	50,000 Operations	50,000 Operations	50,000 Operations	50,000 Operations	50,000 Operations	50,000 Operations
Contact Erosion Limit	3mm	3mm	3mm	3mm	3mm	3mm
Shelf Life	20Years	20Years	20Years	20Years	20Years	20Years
Meets or exceeds the electrical endurance requirements of class E2 for autoreclosing duty per IEC 62271-200 and JB 8738-2008.
Rated Characteristics to be given on request

Product Features & Advantages

1. Excellent Performance, Safety and Durability

The 24KV Vacuum Interrupter Circuit Breaker adopts Cu-Cr alloy contacts (chopping current <3A) and imported 316L stainless steel bellows (annual leakage rate <0.5%), with 30-year design life. Epoxy resin encapsulated pole ensures insulation, adapting to harsh environments (-45℃~+85℃, ≤4000m altitude), and optional operating mechanisms with mechanical life ≥50,000 times.

2. Leading Technology, Controllable Quality

Relying on advanced sealing and leak detection technology, combined with full-process quality control and pre-delivery testing, each product has a unique serial number for traceability. Core components are strictly inspected to ensure consistent quality.

3. Green Intelligence, Wide Adaptability

Without SF₆ emission, it is an eco-friendly alternative, supporting intelligent monitoring and compatible with mainstream switch cabinets (plug-and-play), improving installation efficiency by 35%.

4. Strong Strength, Comprehensive Service

With 25+ core patents, Sunway Hanguang provides OEM/ODM services and 10-20 day delivery for regular models. Global 18 technical centers offer 10-year warranty and 7×24-hour service, ensuring worry-free use of the 24KV Vacuum Interrupter Circuit Breaker.

Product Applications

It is widely used in power systems, industrial production, transportation infrastructure, new energy fields and overseas EPC projects, providing stable support for various high-voltage scenarios.