LZCG530-10 11KV Cast Epoxy Resin Straight-Through Current Transformer

cast epoxy resin current transformer

LZCG series Cast Resin Straight-Through Current Transformer is suitable for current measurement and microcomputer protection of electrical equipment in 10KV and 35KV AC power system. It is widely used in not only compact fully insulated ring network switchgears such as ABB-Safe Ring/Safe Plus, Unstitch, Schneider RM6, SM6, Siemens 8DJ10/8DH10, Simosec, FBX, Fluokit, Omar Garbo GA, GAE; SEL TPS(Q); VEI Unifluorc; Eaton SVS/12 ring network, but also cable distribution boxes because of its small size, light weight, operable and convenient installation. It is very convenient that the transformer can be directly installed at the inlet and outlet cables.



New magnetic material is taken to be the core of the current transformer, which has high magnetic permeability, low saturation magnetization and good stability. Therefore, the measuring accuracy is higher and the instrument security factor is lower. Since the high quality silicon processed by advanced technology is taken to be the core of the protection windings, which assured the accuracy limit factor is higher.

The semicircular ring core and secondary windings are vacuum poured by high quality epoxide resin in the fire retardant plastic casing, which has the characteristic of moisture proof, stable performance and dispensing with maintenance.Small size, light weight, small footprint, fixed in the ring network switchgear cable.The cable can cross the current transformer through its internal poles quickly and uniformly.

The Cast Resin Straight-Through Current Transformer can be divided several kinds according to the various current ratio, accuracy and rated loads. The specific parameters are showed in the corresponding to each model parameter tables.

Model meaning

Cast resin straight-through current transformer

Wiring diagrams

Cast resin straight-through current transformer

P1, P2 is primary polarity terminal, S1, S2 is secondary polarity terminal.
P2, S2 is homonymous terminals (subtractive polarity).


Technical parameters 
Standards IEC60044-1; IEC 61869-2; ANSI C57.13; NTC 2205; GB1208-2006
Rated primary current 30-1000A
Rated load ≤20VA
Rated frequency 50Hz or 60Hz
Rated secondary current 5A or 1A
Rated short-time thermal current 40kA, 1S
Rated continuous thermal current 120%I1n
Secondary winding power-frequency voltage 3kV, 1min
Instrument security factor FS ≤10
Mechanical parameters 
Dimensions (W×D×H) (mm) φ45xφ120x65
Weight (kg) 2.1
Operating conditions 
Operating temperature -35°C to +55°C
Daily average temp <+40°C
Altitude <3500 meters
Operating conditions - continued 
Condition No existence of severely begrimed, erosive and radioactive gas in the air. Permission of long-term operation under rated current.

Technical data

Type LZCG530-10 LZCG530-10 LZCG530-10
Purpose Measuring current transformer Protection current transformer Double winding current transformer
Rated primary current (AMP) Accuracy class and rated load(VA) Accuracy class and rated load(VA) Composite accuracy class and rated load(VA)
0.2S 0.2 0.5 10P20 10P15 10P10 0.2S 0.5 10P15 10P10
30     2              
40     2.5              
50     3.75     2        
75   3.75 5   2 3.75        
100 2.5 5 7.5   2.5 3.75        
150 5 7.5 10 2.5 3.75 6.25 2.5 3.75   2.5
200 7.5 10 15 3.75 5 7.5 5 7.5   3.75
300 10 15 20 5 7.5 10 7.5 10 2.5 5
400 15 20 25 6.25 7.5 15 10 12.5 3.75 5
500 20 25 25 6.25 7.5 15 15 15 3.75 5
600 20 30 30 7.5 10 20 15 20 3.75 7.5

Selection guide

Model Primary rated current Rated load Aperture (mm) Description (mm) Weight (kg) Material Water-proof
LZCK-55 100-1500A ≤10VA φ55 180×138×52 2 PC IP65
LMCK185-10 300-3000A ≤25VA φ185 350×283×55 4.5 PC IP65
LZCK310-10 300-600A ≤10VA φ50 φ50 x φ110 x 32 1 Resin silicon case (option)
LZCK322-10 30-600A ≤10VA φ50 φ50 x φ110 x 52 1.6 Resin silicon case (option)
LZCK350-10 20-600A ≤25VA φ50 φ50 x φ110 x 105 3.1 Resin silicon case (option)
LZCG530-10 30-600A ≤20VA φ45 φ45 x φ120 x 65 2.1 Resin silicon case (option)

Ordering information

All kinds of different specifications and parameters current transformers can be made according to your needs.

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