Shunt Capacitor

BKMJ Seris Low Voltage Self-healing Shunt Capacitor

BKMJ series is dry-type self-healing low voltage shunt capacitor. It adopts metallized polypropylene film as dielectric and dry flame-retardant filling material, with no oil inside. Equipped with built-in pressure disconnector and automatic discharge resistor, it features excellent explosion-proof, anti-leakage and self-healing performance.

Mainly used for power factor correction, harmonic suppression and power quality optimization in industrial distribution cabinets, reactive power compensation cabinets, production lines, data centers and mechanical equipment. It can effectively reduce line loss and stabilize grid voltage.

This series supports 50/60Hz dual frequency and multiple voltage levels (400V/415V/440V/450V), matching 4.5% and 6% series reactors. All products have passed CE certification, fully compliant with IEC 60831-1/2:2014, EU, Vietnam and Southeast Asian import standards.

Model Explanation

- Main Model: BKMJ Three-phase self-healing shunt capacitor (standard for industrial compensation)
- Rated Voltage: 400V / 415V / 440V / 450V (matched with different harmonic environments)
- Reactor Matching Ratio:
  - 4.5% series reactor: for general workshops & light harmonic loads
  - 6% series reactor: for battery factories & equipment with many frequency converters
- Connection Mode: Three-phase Delta connection (default)

Core Features & Advantages

Self-healing Function: Automatically repair tiny breakdown points of the dielectric, extend service life.
Dry & Oil-free Design: Flame-retardant filling material, no leakage, environmental friendly and safe.
Built-in Protection: Integrated over-pressure disconnector + discharge resistor, explosion-proof and prevent electric shock.
Fast Discharge: Terminal voltage drops below 75V within 3 minutes after power off.
Wide Adaptability: 50/60Hz dual frequency, multi-voltage for global industrial grids.
Low Loss: Ultra-low dielectric loss, energy-saving and stable long-term operation.
Complete Certification: CE approved, meet EU & Vietnam import requirements.

Normal Working Conditions

Altitude: ≤ 2000 m above sea level.
Ambient Temperature: -25℃ ~ +50℃ (Class C ambient).
Relative Humidity: ≤90% at 20℃; ≤50% at 40℃, no condensation.
Working Environment: No corrosive gas, conductive dust or severe vibration.
Power Parameter: AC 50/60Hz, voltage fluctuation ≤ ±10%.
Installation: Vertical installation (tilt angle ≤10°), indoor cabinet installation.

Technical Parameters

Model	Rated Capacity (kvar)	Rated Voltage (V)	Frequency	Matched Reactor Ratio	Phase Type
BKMJ-10	10	400	50/60Hz	4.5%	Three-phase
BKMJ-20	20	400	50/60Hz	4.5%	Three-phase
BKMJ-30	30	400 / 415	50/60Hz	6%	Three-phase
BKMJ-40	40	415 / 440	50/60Hz	6%	Three-phase
BKMJ-50	50	440 / 450	50/60Hz	6%	Three-phase
BKMJ-60	60	440 / 450	50/60Hz	6%	Three-phase

Overall Dimension & Installation

Model	Overall Size (L×W×H, mm)	Mounting Hole Pitch (mm)	Hole Diameter	Single Gross Weight (kg)
BKMJ-10	190 × 75 × 230	120 × 60	M8	4.2
BKMJ-20	220 × 85 × 260	140 × 65	M8	5.5
BKMJ-30	245 × 95 × 285	150 × 70	M8	7.0
BKMJ-40	265 × 100 × 310	160 × 75	M10	8.5
BKMJ-50	290 × 110 × 330	180 × 80	M10	9.5
BKMJ-60	320 × 120 × 360	200 × 85	M10	10.5

Packing Specification

Model	Outer Carton (L×W×H, mm)	Quantity Per Carton
BKMJ-10~20	240 × 100 × 300	1 Pcs
BKMJ-30~60	340 × 130 × 380	1 Pcs

Professional Electrical Performance
1. Capacitance Tolerance: -5% ~ +10%.
2. Dielectric Loss: tanδ ≤ 0.1% (low power consumption).
3. Withstand Voltage: 2.15Un for 10s (no breakdown).
4. Discharge Performance: Voltage ≤75V within 3 minutes after power-off.
5. Overload Capacity: Continuously bear 1.1 times rated voltage; 1.3 times voltage for 8h per day.
6. Service Life: More than 100,000 hours under rated working condition.
Application Scope
- Power factor correction & harmonic filtering for factory workshops and production lines;
- Complete sets with ACL/OCL reactors for reactive power compensation cabinets;
- Supporting equipment for battery production lines and frequency converter systems;
- Power quality optimization for data centers and distribution rooms;
- Widely exported to Vietnam, Europe, Africa and other overseas markets.
Custom & After-sales Remark
1. Re-install Interval: Keep more than 3 minutes after power off before re-switch on (for discharge).
2. Maintenance: Must cut off power and confirm low residual voltage before inspection.
3. Custom Service: Special voltage and capacity can be customized.
4. OEM & ODM: Custom logo, nameplate and packaging are supported.
5. Stock & Lead Time: Conventional models in stock, delivery time 3-5 working days.

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