3AH series vacuum circuit breakerDetailed product description：

The Siemens vacuum circuit breaker 3AH series is a new generation product developed and produced based on years of product design and operation experience, the original 3AF vacuum circuit breaker, and improvements made to meet the insulation requirements of the Chinese power system. The 3AH vacuum circuit breaker is strictly controlled by Shanghai Siemens Switchgear Co., Ltd. in accordance with the requirements of the ISO9002 quality assurance system for the procurement, production, and inspection of raw materials. It adopts first-class component processing and product testing equipment synchronized with Germany, and relies on rich manufacturing experience to locally organize and produce high-tech products. The vacuum arc extinguishing chamber of the circuit breaker is manufactured using one-time sealing technology, and the contact material is Cr Cu alloy, which is melted by arc. The contact adopts advanced design shape and structure, with extremely high arc resistance and very small arc voltage drop. Therefore, while ensuring the rated short-circuit current for breaking, the volume of the arc extinguishing chamber can have the smallest size. Siemens, a new type of vacuum arc extinguishing chamber, also has the characteristic of low cutoff value. Therefore, when the circuit breaker is used to disconnect inductive loads such as transformers, there will be no harmful operating overvoltage. The excellent mechanical characteristics of the vacuum arc extinguishing chamber and spring operation also enable the 3AH vacuum circuit breaker to successfully close and open the capacitor group multiple times without the occurrence of reigning overvoltage. The operating mechanism of the circuit breaker adopts spring energy storage, which can be manually or electrically stored. In this organization, all components are tightly processed and assembled. Moreover, key components and materials are manufactured using special processes. In this way, it ensures that the entire operating mechanism has minimal friction, precise coordination between components, and reliable movement.

Technical parameters of 3AH series vacuum circuit breaker

model	rated voltage	Rated short-circuit closing current	Rated short-circuit breaking current	Thermal stability time	rated current	Rated power frequency withstand voltage (to ground/break)	Rated lightning impulse withstand voltage (to ground/fracture)
	(kV)	(kA)	(kA)	(s)	(A)	(kV)1)	(kV)1)	(mm)
3AH5404-1	12	63	25	4	800	42/48	75/85	210
3AH5404-2	12	63	25	4	1250	42/48	75/85	210
3AH3114-3	12	63	25	4	1600	42/48	75/85	210
3AH3114-4	12	63	25	4	2000	42/48	75/85	210
3AH3114-6	12	63	25	4	2500	42/48	75/85	210
3AH5115-2	12	80	31.5	4	1250	42/48	75/85	210
3AH3115-3	12	80	31.5	4	1600	42/48	75/85	210
3AH3115-4	12	80	31.5	4	2000	42/48	75/85	210
3AH3115-6	12	80	31.5	4	2500	42/48	75/85	210
3AH3116-2	12	110	40	4	1250	42/48	75/85	210
3AH3116-3	12	110	40	4	1600	42/48	75/85	210
3AH3116-4	12	110	40	4	2000	42/48	75/85	210
3AH3116-6	12	110	40	4	2500	42/48	75/85	210
3AH3116-7	12	110	40	4	3150	42/48	75/85	210
3AH3116-8	12	110	40	4	40002)	42/48	75/85	210
3AH3187-2	12	125	50	3	1250	42/48	75/85	210
3AH3187-3	12	125	50	3	1600	42/48	75/85	210
3AH3187-4	12	125	50	3	2000	42/48	75/85	210
3AH3187-6	12	125	50	3	2500	42/48	75/85	210
3AH3187-7	12	125	50	3	3150	42/48	75/85	210
3AH3187-8	12	125	50	3	40002)	42/48	75/85	210
1) If you require higher insulation levels and special distances, please contact us.
2) OEM switchgear forced air cooling.