3-in-1 Circuit Breaker TYD-12GD,Indoor Switch-3-in-1 Circuit Breaker TYD-12GD-Wenzhou Tuyuan Electric Co.,Ltd

The TYD-12GD series offers outstanding electrical and mechanical performance with a highly reliable mechanism and extended service life. Using solid-sealed poles, it ensures superior insulation reliability and environmental adaptability.

Designed for 3.6–12kV power systems, it serves as a protection and control unit for utilities and industrial applications. With strong performance under frequent operations and short-circuit interruptions, the breaker delivers maintenance-free operation and is equipped with comprehensive mechanical and electrical interlocks to guarantee operator and equipment safety.

The product adopts a modular design with a frame structure, integrating the disconnector, vacuum circuit breaker, earthing switch, interlocking mechanism, and operating mechanism into a compact high-performance unit.

Compact dimensions: The minimum cabinet width can be as small as 500mm, with customizable options of 550mm, 600mm, 800mm, and others according to user requirements, offering flexible solutions.

Rotary disconnector: Provides a clearly visible isolating gap after opening.

Reliable interlocking: The disconnector, circuit breaker, and earthing switch are equipped with mechanical interlocks to prevent misoperation.

Modular operating mechanism: The breaker’s mechanism can be independently replaced or serviced, ensuring good interchangeability. Manual operation is available, with optional AC/DC spring operating mechanisms for remote control.

Enhanced safety: The cabinet door and earthing switch feature a reliable interlock design to ensure operator safety.

No.	Item	Unit	Data
1	Rated Voltage	kV	12
2	1 min rated short-time PF withstand voltage, P to P / across the open contacts	kV	42/48
3	Rated lightning impulse withstand voltage (peak )	kV	75/85
4	1 min secondary circuit PF withstand voltage	V	2000
5	Rated frequency	Hz	50/60
6	Rated current	A	630/1250
7	Rated short-circuit breaking current	kA	20	25	31.5
8	Rated peak withstand current	kA	50	63	80
9	Rated short-circuit making current	kA	50	63	80
10	4S rated short-time withstand current	kA	20	25	31.5
11	Rated short-time withstand current duration	S	4
12	Rated breaking current of single/back-to-back capacitor bank	A	400/630
13	Rated closing inrush current of capacitor bank	kA	12.5 （Frequency ＜1000Hz）
14	Rated short-circuit current breaking times	times	30
15	Mechanical life: Disconnector	times	3000
16	Mechanical life: Breaker	times	10000
17	Mechanical life: Earthing	times	3000
18	Permissible cumulative wear thickness of moving and fixed contacts	mm	3
19	Rated closing operation voltage	V	AC24/48/110/220 DC24/48/110/220
20	Rated opening operation voltage	V	AC24/48/110/220 DC24/48/110/220
21	Energy storage motor rated voltage	V	AC24/48/110/220 DC24/48/110/220
22	Energy storage motor rated power	W	90
23	Energy storage time	S	≤15
24	Contact gap	mm	9±1
25	Overtravel	mm	3.5±1
26	Contact closing bounce time	ms	≤2
27	Three-phase opening and closing asynchronism	ms	≤2
28	Opening time（rated voltage）	ms	≤40
29	Closing time（rated voltage）	ms	≤60
30	Average opening speed	m/s	0.9-1.3
31	Average closing speed	m/s	0.5-1.1
32	Contact opening bounce amplitude	mm	≤2
33	Contact closing pressure	N	2400±200（20-25kA）3100±200（31.5kA）
34	Rated operating sequence	-	O-0.3s-CO-180s-CO
35	Protection level	-	IP4X

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