Chint NEG3-62020 32A

Chint NEG3-62020 32A: Complete Analysis of Residual Current Device for Air Conditioners (Including Selection/Replacement/Installation)

Core Positioning: Chint NEG3-62020 32A is a fixed residual current device (RCD) exclusively for three-phase air conditioners (not a contactor). It integrates triple protection against leakage, overload and short circuit, with a rated residual operating current of 30mA. Suitable for 3P air conditioner/three-phase motor circuits, it features installation with 86-type junction boxes and is universally applicable in industrial and commercial scenarios.

Core Technical Parameters (Authoritative Specifications)

Item	Parameter Value	Remarks
Product Type	Fixed Residual Current Operated Circuit Breaker (RCD)	Custom design for air conditioners
Model	NEG3-62020 32A	Complete specification marking
Rated Operating Current	32A	Suitable for loads ≤32A
Pole Number	3P (Three-phase)	Breaks three-phase live wires
Rated Voltage	400V AC (Three-phase)	Adapted to 380V air conditioning systems
Rated Residual Operating Current	30mA (IΔn)	Fast-acting type for personal safety
Breaking Capacity	6kA	For handling line short-circuit faults
Tripping Characteristic	Type C	Suitable for inductive loads (air conditioners/motors)
Mechanical Life	≥10,000 operations	Industrial-grade durability
Electrical Life	≥5,000 operations	Meets frequent on-off requirements
Protection Class	IP20	For indoor installation environments
Pollution Degree	Class 2	General industrial/commercial environments
Applicable Standards	GB/T 16917.1, IEC 61009-1	Complies with national and international standards

In-depth Interpretation of Model Coding (Quick Specification Identification)

The coding logic of `NEG3-62020 32A` is clear and unambiguous:

NEG3: Product series (3-pole series of RCDs exclusively for air conditioners);

6: Design serial number/function code (exclusive for air conditioners);

20: Rated residual operating current code (20 = 30mA, universal industry marking);

32A: Rated operating current (core selection parameter).

III. Installation Dimensions and Fixing Methods (Precise Adaptation for Distribution Cabinets/Air Conditioner Installations)

Dimension Item	Parameter Value (mm)	Installation Requirements
Overall Dimension	868635	Adapted to standard 86-type junction boxes
Mounting Hole Spacing	60*60	4 M4 mounting holes
Installation Method	Surface mounting with junction box	Special 86-type junction box required
Terminal Block	Screw compression type	Adapted to 10-16mm wires
Wiring Direction	Top in, bottom out	Complies with electrical installation specifications

Core Application Scenarios (Precise Demand Matching)
3P air conditioner dedicated circuits: Triple protection against leakage, overload and short circuit for 380V three-phase cabinet air conditioners/central air conditioning terminals; the 30mA RCD ensures personal safety.
Three-phase motor control: Used in conjunction with AC contactors (e.g., CJX2-3222) to provide end-of-line leakage protection for three-phase motors ≤32A and prevent electric shock accidents.
Industrial/commercial equipment: Safety power supply protection for three-phase equipment such as water pumps, fans and small compressors, suitable for industrial plants, shopping malls, hotels and other premises.
Renovation and upgrading: Replacement for old three-phase RCDs, compatible with 86-type junction boxes without the need for re-drilling.
Key Selection and Replacement Solutions (Engineering Procurement Guide to Avoid Pitfalls)
Comparison of Models in the Same Series (Select as Required)

Model	Rated Current	Applicable Scenario	Reference Price (2026)
NEG3-62020	32A	3P air conditioners/32A three-phase equipment	CNY 25-40 per unit
NEG3-62030	40A	3P air conditioners/40A three-phase equipment	CNY 30-45 per unit
NEG3-62040	50A	3P air conditioners/50A three-phase equipment	CNY 35-50 per unit

Cross-series Replacement Solutions (Flexible System Adaptation)

Demand Type	Chint Recommended Model	Replacement Advantages
Standard distribution cabinet installation	NXBLE-32 3P 32A 30mA	DIN rail mounting, adapted to distribution cabinet layout
Household/small-scale commercial use	NB7LE-32 3P 32A 30mA	Compact size, adapted to lighting boxes
Contactor + RCD combination	CJX2-3222 + DZ47LE-3P 32A	Complete motor control solution (control + protection)
Replacement for Siemens NEG3 contactor	CJX2-3222	3-pole, 2 normally open + 2 normally closed, consistent installation dimensions, direct replacement without re-drilling

Practical Key Points for Installation and Operation & Maintenance (Engineering Implementation Guide)
Junction box selection: A standard metal/plastic 86-type junction box must be used to ensure firm installation and good heat dissipation.
Wiring specifications: Connect three-phase live wires in the order of L1, L2 and L3; the neutral wire does not pass through the 3P RCD (must be connected to the N-terminal block separately).
Torque control: The torque of terminal blocks is 2.0-2.5N·m to avoid heating caused by loose connections.
Testing requirements: After installation, press the “TEST” button to test the leakage protection function to ensure normal operation.
Maintenance cycle: Inspect once a quarter and press the “TEST” button to test once a year to ensure effective protection.
Troubleshooting:

Frequent tripping: Inspect line insulation/load leakage, and reset after troubleshooting.

No tripping: Inspect for damaged RCD or incorrect wiring, and replace or rectify in a timely manner.

Summary and Selection Suggestions

Chint NEG3-62020 32A is a specialized RCD for 3P air conditioner circuits with the following core advantages:

Precise adaptation: The combination of 30mA RCD and 32A rated current perfectly matches the requirements of 380V air conditioners/three-phase motors.
Easy installation: Universal compatibility with 86-type junction boxes, no special tools required.
Triple protection: Integrated protection against leakage, overload and short circuit for high safety and reliability.