Name: Special power distribution cabinet for charging piles
SKU: 2273921

Product Introduction

I. Product Overview and Core Positioning
The XL-21 charging pile power distribution cabinet is a low-voltage complete set of equipment deeply customized based on the XL-21 standard cabinet. Its core innovation lies in the integration of an electrical fire-proof current-limiting protector, which solves industry pain points such as delayed short-circuit response of charging pile circuits and arc fire risks. It fully complies with the mandatory protection requirements for terminal circuits in charging places specified in GB 51348-2019 *Electrical Design Standard for Civil Buildings*.
Core Values:
- Safety and Explosion Protection: The current-limiting protector cuts off short-circuit current at a microsecond-level speed (≤150μs), suppresses arc sparks, and reduces the risk of electrical fires by more than 90%;
- Efficient Operation and Maintenance: Supports live replacement of switches in branch circuits, reducing the downtime of charging stations;
- Flexible Adaptation: Covers the power requirements of 7kW~120kW AC/DC charging piles, compatible with multiple scenarios such as residential areas, commercial areas, and public fast-charging stations.
II. Structural Design and Core Technologies
1. Enhanced Design of XL-21 Cabinet
Cabinet Structure:
Made of 1.5~3.0mm cold-rolled steel plates (304 stainless steel optional) through welding, with a surface treated by phosphating + electrostatic spraying, achieving a corrosion resistance grade of C4, suitable for high-humidity environments such as underground garages;
Protection grade meets IP30 standard (IP65 outdoor rainproof type optional), with a waterproof top cover and lifting rings installed on the cabinet top.
2. Technology of Electrical Fire-Proof Current-Limiting Protector

Functions	Technical Indicators	Application Advantages
Short-circuit current limiting	Response time ≤ 150μs, Current limiting capacity ＞ 80%	Suppresses explosive arcs and avoids millisecond-level delays of traditional circuit breakers
Overload protection	Action time 3~60s adjustable	Matches the dynamic load characteristics of charging piles
Multi-parameter monitoring	Real-time monitoring of voltage, current, cable temperature, leakage current	Supports triple alarms for overvoltage/undervoltage, leakage, and overtemperature
Communication interface	S485 + 4G/NB-IoT wireless transmission	Accesses the charging station EMS system to realize remote fault diagnosis

Fire protection compliance: Strictly follow the GB 14287.6 standard, deployed on the lower side of the incoming line switch of the terminal distribution box, and the rated current is consistent with the circuit protection switch.

III. Charging pile power matching scheme
Accurately select the current-limiting protector according to the type and power of the charging pile:

Types of Charging Piles	Power Range	Matched Current-Limiting Protector Models	Rated Current	Installation Methods
AC Slow Charging (Single Gun)	7kW	ASCP210-40D (Single-phase)	40A	Rail-mounted
AC Slow Charging (Dual Guns)	14kW	ASCP210-63D (Single-phase)	63A	Rail-mounted
DC Fast Charging	30~60kW	ASCP310-63B / ASCP320-125B (Three-phase)	63A/125A	Wall-mounted
Ultra-Fast Charging Pile	120kW	ASCP320-125B (Three-phase)	250A	Wall-mounted

IV. Multiple Protection Mechanisms and Intelligent Management

Five-Level Protection System

Instant short-circuit breaking: The current-limiting protector operates at the microsecond level;
Overload inverse time limit: The electronic tripping curve matches the thermal tolerance of the cable;
Leakage monitoring: Adjustable residual current from 30mA to 500mA (optional);
Temperature control: Cable temperature sensor alarms when the temperature is ≥85℃;
Voltage tolerance: Automatic power-off in case of overvoltage (≥470V) and undervoltage (≤270V).

Intelligent Operation and Maintenance**
Fault recording: Records 20 events (including short-circuit current peak and action time);
Acousto-optic alarm: Dual warnings from a local buzzer and cabinet door indicator light;
Remote control: Remote reset or parameter setting via APP/SCADA.

V. Overview of Technical Parameters

Items	*Parameters	Remarks
Rated voltage	AC 380V (690V insulation)	Compatible with three-phase five-wire system
Main bus current	≤630A (copper bar TMY)	Short-time withstand capacity of 10kA/1s
Branch circuit current	16A~250A	Select appropriately according to the power of the charging pile
Protection class	IP30 (indoor) / IP65 (outdoor)	Stainless steel cabinet is preferred, supporting a low temperature of -25℃
Communication protocol	Modbus	Support for the charging pile billing system

VI. Installation and Operation & Maintenance Specifications
1. Installation Points:
- The cabinet shall be installed vertically against the wall (inclination ≤5°), with foundation bolts ≥M12;
- The current-limiting protector shall be placed on the lower side of the incoming line switch, and the wiring torque shall be calibrated in accordance with IEC 61439;

2. Maintenance Cycle:
- Monthly: Dust cleaning (blowing the heat dissipation holes with compressed air);
- Annual: Calibrating the action time and capacitance value of the current-limiting protector (replace if the capacitance attenuation exceeds 10%);

3. Fault Emergency Handling:
- Frequent alarms → Detect harmonic content (add a reactor when THDi > 8%);
- Overheating of the protector → Check ventilation or use with derated capacity.

Summary: A New Benchmark for Charging Pile Power Distribution Safety
The XL-21 integrated current-limiting protector solution, through three innovations of "rapid arc interruption + intelligent early warning + precise power matching", directly addresses the core pain points of charging pile power distribution:
- Leap in safety: 150μs short-circuit response speed, eliminating the arc ignition risk of traditional protection devices;
- 40% reduction in whole-life cycle cost: Reducing fault downtime + eliminating the need for fuse replacement;
- Compliance guarantee: Meeting the mandatory requirements of GB 51348-2019 for charging terminal circuits.

Engineering Recommendations: For high-humidity places (such as underground garages), stainless steel IP65 cabinets are preferred; fast-charging piles above 60kW shall be equipped with three-phase 250A current-limiting protectors + temperature monitoring modules.

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