SRMWK1 series intelligent low-voltage vacuum circuit breakerDetailed product description：

The SRMWK1 series intelligent low-voltage vacuum circuit breaker (hereinafter referred to as the circuit breaker) has a rated voltage of 380V-1140V and a rated current of 630A-2500A. As long as it is suitable for distributing electrical energy in low-voltage AC distribution systems, protecting lines and power equipment from overload, short circuit, undervoltage and other faults, and has grounding protection function in TN distribution systems with transformer neutral point grounding, the circuit breaker can be used for infrequent line switching under normal conditions.
The circuit breaker adopts ST30 intelligent controller, which has multiple protection functions, can achieve selective protection, accurate action, and can also be equipped with communication interface according to user needs to achieve remote control, remote adjustment, and telemetry of the circuit breaker within one kilometer range.
Compared with air circuit breakers, this circuit breaker has a longer service life, more short-circuit breaking times, stronger arc extinguishing ability, and truly achieves zero arcing. Can be used in places where air circuit breakers are currently unavailable or unsuitable for use (such as places that require high power supply reliability, do not allow frequent power outages for maintenance, operate frequently, and have harsh environmental conditions such as fire and explosion hazards). The circuit breaker meets current environmental and safety requirements.
The circuit breaker is designed, manufactured, and inspected in accordance with GB14048.2 standard.

Environmental conditions for use
One Normal working conditions
1. Surrounding air temperature: The upper limit should not exceed+40 ℃, the lower limit should not be lower than -5 ℃, and the average value over 24 hours should not exceed+35 ℃.
2. Altitude: The installation location should not exceed an altitude of 2000m.
3. Atmospheric conditions: The relative humidity of the atmosphere does not exceed 50% when the surrounding air temperature is+40 ℃. At lower temperatures, there can be higher relative humidity. The average maximum relative humidity in the wettest month is 90%, and the average minimum temperature in that month is+25 ℃, taking into account the condensation that occurs on the surface of the product due to temperature changes.
4. Pollution level: Level 3
II Installation requirements
1. The circuit breaker should be installed according to the installation requirements in the user manual provided by the manufacturer
2. Installation category: Circuit breakers with a rated working voltage of 690V and below are used for installation category IV; the installation category for auxiliary circuits is III, except for the undervoltage release coil, the primary coil of the power transformer, and the same as the circuit breaker.

Main technical parameters of SRMWK1 series intelligent low-voltage vacuum circuit breaker

The rated current of the circuit breaker is shown in the following table:

Shell level rated current (Inm) A	Rated current (In) A
one thousand and six hundred	630, 800, 1000, 1250, 1600

2. The rated working voltage and rated insulation voltage of the circuit breaker are shown in the following table:

Rated insulation voltage (Ue) V		one thousand one hundred and forty
Rated working voltage (Ue) V	four hundred	six hundred and ninety	one thousand one hundred and forty

3. The rated short-circuit breaking capacity and short-time withstand current of the circuit breaker are shown in the following table:

project	Current kA
	400V	690V	1140V
Rated ultimate short-circuit breaking capacity	65/70	65/70	forty
Rated operating short-circuit breaking capacity	sixty-five	sixty-five	forty
Rated short-time withstand current	65/70	40/50	forty
Rated short-time withstand current short delay breaking capacity (0.4s)	65/70	40/50	forty

Note: 1. The numerator in the table represents standard technical indicators, and the denominator represents high scoring (H-type) technical indicators.
When 2.50kA and below, cos φ=0.25, and when 65kA and above, cos φ=0.2.

4. The rated voltage of the circuit breaker's release, closing electromagnetic coil, and operating motor is shown in the following table:

type	Rated voltage V
	Single phase AC 50Hz	direct current
Split release device (Us)	220, 380	110, 220
Undervoltage release (Ue)	220, 380
Electric operating mechanism (Us)	220, 380	110, 220
Energy Release Electromagnets (Us)	220, 380	110, 220

Structural characteristics

The circuit breaker consists of a frame, an operating mechanism, a contact arc extinguishing system, an intelligent controller, a cotton board, a drawer seat, and other parts.
1. The operating mechanism is installed on the right front of the circuit breaker, connected to the contact system through the main shaft, including electric operation and manual energy storage operation, which do not interfere with each other.
2. The contact is contained in the vacuum arc extinguishing chamber, truly achieving zero arcing.
3. There are "I", "O", "energy storage" and "energy release" indicators on the panel that display the working status of the circuit breaker, as well as buttons "I", "O", ST30 controller and manual closing handle for closing and opening the circuit breaker.
4. The ST30 controller is an electronic intelligent release device with four protection functions: overload long delay, short circuit short delay, short circuit instant, and ground leakage. It also has current display, setting, testing, fault inspection, load monitoring, and self diagnosis functions. It can also be equipped with a communication interface according to user needs to achieve remote control, remote adjustment, remote sensing, and remote signaling of the circuit breaker within one kilometer.