Product Overview

The LZZBJ9-35 current transformer is a dry-type epoxy-resin insulated instrument transformer designed for medium-voltage switchgear applications requiring compact installation, accurate metering and dependable relay protection. With a 195 mm equipment width, this CT is suitable for 800 mm and wider switchgear cabinets, helping panel builders reserve adequate busbar clearance, secondary wiring space and maintenance access while keeping the overall cabinet layout compact.

The product uses high-quality epoxy resin insulation, precision magnetic cores and full copper secondary windings to support stable operation under demanding electrical conditions. It can be specified for IEC 61869 and IEEE C57-based projects, with optional special protection classes such as PR, PX, PXR, TPX, TPY, TPZ or IEEE C-class protection performance according to the project requirement.

LZZBJ9-35 Epoxy Resin Current Transformer for 800 mm Switchgear Cabinets Product Display

Product Type

Item	Specification
Product name	Medium-Voltage Epoxy Resin Current Transformer
Model	LZZBJ9-24
Application	Current measurement, energy metering and relay protection
Installation condition	Indoor switchgear installation
Recommended cabinet width	800 mm and above
Equipment width	195 mm
Insulation medium	High-quality epoxy resin
Internal winding material	Full copper winding
Rated primary current	5–600/5 reference range; project-specific ratios available
Accuracy class	0.5 / 0.2 / 0.2S optional; special classes by agreement

Positioning

This product should be positioned as a compact-width MV current transformer for 800 mm switchgear cabinets. Unlike general-purpose CT descriptions that only focus on accuracy or insulation, this page should clearly tell engineers the installation value: the 195 mm equipment width helps match common medium-voltage cabinet designs while leaving space for busbar connection, phase clearance and secondary terminal access.

Positioning Point	Technical Meaning	Website Expression
195 mm width	Compact CT body width	Designed for 800 mm and wider switchgear cabinets
Epoxy insulation	Dry-type, oil-free insulation structure	High-quality epoxy resin insulation with low partial discharge
Full copper winding	Stable conductivity and thermal performance	Full copper secondary winding for reliable metering and protection output
International standards	Supports IEC and IEEE project documentation	IEC 61869, ANSI/IEEE C57.13 and NEMA-oriented specification support
Special protection classes	Advanced relay protection requirements	PR, PX, PXR, TPX, TPY, TPZ or IEEE C100–C800 available by design

Applications

Medium-voltage indoor switchgear and distribution panels
800 mm and wider cabinet structures requiring compact CT installation
Energy metering, current measurement and feeder monitoring circuits
Relay protection and backup protection circuits
Industrial power distribution, utility substations and grid-side equipment
Projects requiring IEC 61869 or ANSI/IEEE C57.13 compliance
High-altitude installations requiring IEC 61869 and IEEE C57 correction up to approximately 5000 m

Features

Optimized cabinet fit: 195 mm equipment width, suitable for 800 mm and wider medium-voltage cabinets.
High-quality epoxy resin insulation: Dry-type insulation structure with strong mechanical strength and low partial discharge performance.
Full copper winding: Good conductivity and current-carrying performance for stable CT operation.
High metering accuracy: 0.5 / 0.2 / 0.2S classes can be selected according to metering requirements.
Protection class flexibility: Special classes such as PR, PX, PXR, TPX, TPY, TPZ or IEEE C100–C800 can be engineered by project requirement.
International project support: IEC 61869, ANSI/IEEE C57.13, NEMA and related certification requirements can be considered at quotation and design stage.

Standards and Certification Capability

The following standards and certification systems can be used as project reference requirements. Final compliance scope depends on the ordered specification, routine test plan, type test requirement and certification documents agreed with the customer.

Category	Reference Standards / Certifications
Instrument transformer standards	IEC 61869, ANSI/IEEE C57.13, NEMA
Quality and certification references	ISO 9001, KEMA, CESI, CE, TUV, UL, ASTA
Seismic design references	ETGI-1.020, IEEE Standard 693, NCh2369
Structural design references	ASTM A325, ANSI/AISC 360, AWS D1.1
High-altitude correction	According to IEC 61869 and IEEE C57, correction can be considered for installations up to approximately 5000 m

Technical Data

Item	Specification
Type	Current transformer for current measurement and protection
Construction	Dry-type epoxy resin cast structure
Application	Industrial and utility power systems, grid service, metering, protection and substations
Phase	Single-phase
Installation type	Indoor switchgear installation
Recommended cabinet width	800 mm and above
Equipment width	195 mm
Primary current range	5–600/5 reference range; customized current ratios available
Secondary current	5A or 1A according to project requirement
Accuracy class	0.5 / 0.2 / 0.2S optional
Special protection classes	PR, PX, PXR, TPX, TPY, TPZ or IEEE C100–C800 by agreement
Insulation medium	Epoxy resin
Internal material	Full copper winding
Primary voltage reference	24 kV reference platform; final voltage class according to project design
Secondary voltage reference	Up to 220 V; minimum 110 V reference where applicable

Dimensional and Installation Notes

Item	Recommended Design Note
Equipment width	195 mm
Cabinet compatibility	Suitable for 800 mm and wider cabinet structures
Installation position	Install according to switchgear primary busbar layout, phase spacing and terminal access direction
Busbar clearance	Confirm phase-to-phase and phase-to-ground clearance before cabinet production
Secondary wiring	Reserve enough space for terminal cover opening, secondary cable routing and grounding connection
Maintenance access	Keep front or side access space for terminal inspection and nameplate reading

Windings & Terminal Marking

The primary terminals are normally marked P1 and P2. The secondary terminals should be marked according to the number of secondary windings and the approved wiring diagram. For metering and protection configurations, each secondary group should be assigned to a clear function before production.

Terminal	Function	Application Note
P1 / P2	Primary terminals	Used for primary current direction and polarity reference.
1S1 / 1S2	First secondary winding	Usually assigned to metering or current measurement.
2S1 / 2S2	Second secondary winding	Usually assigned to relay protection or backup protection.
Grounding point	Secondary grounding reference	One point of the secondary circuit should be grounded according to project practice.

Engineering Selection

Confirm cabinet size: Use this product where the cabinet width is 800 mm or above and the CT width of 195 mm fits the busbar layout.
Confirm current ratio: Select the primary current according to feeder load, protection setting and metering range.
Select accuracy class: Use 0.2S or 0.2 for high-accuracy metering; use 0.5 for general measurement.
Define protection requirement: Select PR, PX, PXR, TPX, TPY, TPZ or IEEE C-class only when the relay protection study requires it.
Check altitude: For high-altitude projects up to approximately 5000 m, apply insulation and correction requirements according to IEC 61869 and IEEE C57.
Check installation clearance: Confirm phase spacing, busbar hole pattern, terminal cover access and secondary wiring path before production.
Confirm documents: Specify required standard, test report, certification file, label language and packing requirement before order.

FAQs

The key advantage is its 195 mm equipment width, which makes it suitable for 800 mm and wider medium-voltage switchgear cabinets while leaving room for busbar clearance and secondary wiring.

Project specifications can refer to IEC 61869, ANSI/IEEE C57.13 and NEMA. Certification and test document requirements such as KEMA, CESI, CE, TUV, UL or ASTA should be confirmed before order.

General metering classes include 0.5, 0.2 and 0.2S. Special protection classes such as PR, PX, PXR, TPX, TPY, TPZ or IEEE C100–C800 can be considered by project design.

Yes, high-altitude correction can be considered according to IEC 61869 and IEEE C57, with project-specific evaluation for installations up to approximately 5000 m.

Check cabinet width, CT width, busbar clearance, primary terminal position, secondary wiring path, grounding point and terminal cover access before cabinet production.

Full copper winding provides good conductivity and stable thermal performance, helping the CT maintain reliable output for metering and protection circuits.

Please provide model, voltage class, current ratio, secondary current, accuracy class, protection class, cabinet width, installation drawing, altitude, standard requirement, test report and certification requirements.

LZZBJ9-24/195W/4S Epoxy Resin Current Transformer 195 mm