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LZZBJ9-10 Series Current Transformer

The LZZBJ9-10 series current transformer is an indoor type epoxy resin cast fully enclosed structure, suitable for 10kV and below power systems. It is a core equipment for current measurement, metering, and protection in switchgear, distribution rooms, and substations.
This series features compact size, light weight, excellent insulation performance, high measurement accuracy, strong dynamic and thermal stability, and maintenance-free operation. It is widely used in industrial enterprises, commercial buildings, residential communities, and infrastructure distribution facilities.


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Technical Parameters

Electrical Performance Parameters

Parameter	Specification
Rated Voltage	10kV / 12kV
Rated Frequency	50Hz / 60Hz
Rated Primary Current	5A ~ 5000A
Rated Secondary Current	5A / 1A
Rated Insulation Level	12/42/75kV
Accuracy Class	Metering: 0.2S / 0.2 / 0.5S / 0.5
	Measurement: 0.5 / 1.0
	Protection: 5P10 / 5P20 / 10P10 / 10P20
Rated Output	5VA ~ 50VA
Rated Short-Time Thermal Current	2.5kA ~ 63kA (1 Second)
Rated Dynamic Current	6.3kA ~ 160kA (Peak)
Insulation Medium	Epoxy Resin Cast
Protection Class	IP20 / IP40
Installation Method	Post Type / Bushing Type

LZZBJ9-10 Series Complete Parameter Table

No.	Rated Primary Current (A)	Accuracy Class Combination	Rated Output (VA)	Short-Time Thermal Current (kA/1s)	Dynamic Current (kA)
1	5-100	0.2S/0.5/10P10	10/15/15	2.5	6.3
2	150-200	0.2S/0.5/10P10	10/15/15	5	12.5
3	300-400	0.2S/0.5/10P10	15/20/20	10	25
4	500-600	0.2S/0.5/10P10	15/20/20	15	37.5
5	800-1000	0.2S/0.5/10P20	20/25/25	25	62.5
6	1200-1500	0.2S/0.5/10P20	20/25/25	31.5	80
7	2000-2500	0.2S/0.5/10P20	25/30/30	40	100
8	3000-4000	0.2S/0.5/10P20	30/40/40	50	125
9	5000	0.2S/0.5/10P20	40/50/50	63	160

Note: Accuracy class combinations can be customized according to customer requirements, supporting various combinations such as 0.2S/0.5/5P10, 0.2S/0.5/5P20, etc.

Outline Dimension Reference Table

Rated Primary Current (A)	L / Length (mm)	W / Width (mm)	H / Height (mm)	Mounting Hole Distance (mm)	Weight (kg)
5-200	140	120	200	95	8
300-600	160	130	220	105	10
800-1000	180	150	240	115	13
1200-1500	200	160	260	125	16
2000-2500	220	170	280	135	20
3000-4000	250	190	310	150	26
5000	280	210	340	165	32

Note: The above dimensions are reference values. Specific dimensions can be customized according to customer requirements.

Accuracy Class & Application

Accuracy Class	Application	Permissible Error
0.2S / 0.2	Energy Metering	Low error, high accuracy, suitable for high-precision billing
0.5S / 0.5	Measurement	Suitable for general measurement
1	Measurement	Suitable for indicating instruments
5P10 / 5P20	Protection	Protection class, error ≤5% at 10x or 20x rated current
10P10 / 10P20	Protection	Protection class, error ≤10% at 10x or 20x rated current

Applications

Application	Recommended Primary Current	Recommended Accuracy
Switchgear Metering	50-1000A	0.2S / 0.5
Switchgear Protection	100-2000A	5P10 / 5P20
Distribution Room Incoming Cabinet	800-2500A	0.2S / 5P20
Industrial Enterprise Distribution	100-2000A	0.5 / 10P10
Commercial Building Distribution	200-1000A	0.5 / 10P10
Residential Community Distribution	100-800A	0.5 / 10P10

Selection Guide

Primary Current Selection

Select primary current based on load current, typically 1.2-1.5 times the load current:

Load Current (A)	Recommended Primary Current (A)
≤ 80	100
80-160	200
160-250	300
250-400	500
400-500	600
500-640	800
640-800	1000
800-1000	1200
1000-1280	1500
1280-1600	2000
1600-2000	2500

Accuracy Class Selection

Application Requirement	Recommended Accuracy
High-Precision Energy Metering	0.2S
General Energy Metering	0.5S
Distribution Measurement	0.5 / 1.0
Overcurrent Protection	5P10 / 5P20
Ground Protection	10P10 / 10P20

Secondary Current Selection

Secondary Current	Applicable Scenario
5A	Conventional instruments and protection devices, short transmission distance
1A	Long-distance transmission, reduces line loss

Customization Services

Sline provides comprehensive customization services for LZZBJ9-10 series current transformers based on your project requirements:

Customization Option	Description
Primary Current Customization	5A ~ 5000A / Full range coverage
Secondary Current Customization	5A / 1A / Optional
Accuracy Class Combination	0.2S/0.5/5P10/5P20/10P10/10P20 / Various combinations available
Rated Output	5VA ~ 50VA / Optional
Protection Class	IP20 / IP40 / Optional
Installation Method	Post Type / Bushing Type

For detailed technical drawings or customized solutions, please contact the Sline technical team. We will provide one-on-one engineer-led service throughout the process.