Does 72.5 kV tell me the breaker’s interrupting capacity?

No. Rated voltage, continuous current and short-circuit breaking current are separate parameters. The required breaking duty and transient recovery voltage must be checked against the network study and the selected breaker’s test evidence.

Is the pictured configuration SF6-free?

No SF6-free claim is made. The reference configuration uses SF6. If the project requires another insulation/interruption arrangement, state that requirement before a model is proposed and verify the offered configuration explicitly.

Are current transformers included in a dead-tank breaker?

They may form part of the selected arrangement, but inclusion is not automatic. Specify ratios, protection/metering cores, accuracy, burden and terminal interfaces so the quotation clearly defines the CT scope.

What information is needed for a utility protection review?

Provide the fault-duty and insulation study, operating sequence, control supply, protection logic, CT requirements and site conditions. Agree the applicable IEC/IEEE basis, witness tests and utility acceptance documents for that exact model.

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1-888-688-8077 contact@entogo.ca

Switchgear & Circuit Breakers

Dead Tank Circuit Breaker

Representative configuration. The offered model, dimensions and interfaces are confirmed with the technical proposal.

Overview

Entogo supplies outdoor dead-tank circuit breakers for substation switching and protection. A 72.5 kV SF6 configuration is a reference enquiry point; continuous current, breaking duty, insulation and site conditions are specified together.

Entogo supplies this project equipment through manufacturing partners. Entogo Inc. in Toronto coordinates technical selection, supply scope and order support.

Specification	Value
Construction	Outdoor dead-tank circuit breaker; tank at earth potential
Reference voltage class	72.5 kV configuration; other classes require a separate proposal
Reference insulation medium	SF6; an SF6-free design is not implied
Continuous current	Rated amperes selected for circuit loading and temperature rise
Breaking performance	Short-circuit breaking current, TRV and operating sequence
Mechanism	Trip/close supply, operating mechanism and interlocks to agree
Instrument transformers	CT ratios, cores, accuracy and protection duties if included
Design reference	IEC 62271-100 or the agreed IEEE/utility specification

Reference configurations and selection criteria are shown together. The technical offer defines the matched ratings, tests and guaranteed performance for the ordered unit.

Specify the interruption duty, not just the voltage class

A 72.5 kV designation does not define short-circuit breaking capacity. Include the available fault current, transient recovery voltage requirements and operating sequence from the protection study.

This is standalone substation equipment. It is not the withdrawable breaker inside a metal-clad panel. Define foundations, clearances, control cabling, earthing and instrument-transformer interfaces as part of the purchase scope.

Applications

Utility substations
Industrial substations
Line and transformer switching

Selection & project requirements

Does 72.5 kV tell me the breaker’s interrupting capacity?: No. Rated voltage, continuous current and short-circuit breaking current are separate parameters. The required breaking duty and transient recovery voltage must be checked against the network study and the selected breaker’s test evidence.
Is the pictured configuration SF6-free?: No SF6-free claim is made. The reference configuration uses SF6. If the project requires another insulation/interruption arrangement, state that requirement before a model is proposed and verify the offered configuration explicitly.
Are current transformers included in a dead-tank breaker?: They may form part of the selected arrangement, but inclusion is not automatic. Specify ratios, protection/metering cores, accuracy, burden and terminal interfaces so the quotation clearly defines the CT scope.
What information is needed for a utility protection review?: Provide the fault-duty and insulation study, operating sequence, control supply, protection logic, CT requirements and site conditions. Agree the applicable IEC/IEEE basis, witness tests and utility acceptance documents for that exact model.

For Canadian and US projects, include the utility specification, service frequency and required approvals. State whether the order is for the transformer alone or an integrated equipment package.

Discuss your equipment requirements

Send your single-line diagram, load or process data, target market and required schedule. We will identify the configuration and documents needed for a technical quotation.

Design references

Power & Distribution

Available fault current and equipment short-circuit ratings: what to calculate and specify

Available fault current is the maximum current a bolted short circuit can push through a system at a point. Every breaker, switchboard, and control panel needs a short-circuit current rating at least equal to it, and non-dwelling service equipment must be field-marked with the value under NEC 110.24.

View

Power & Distribution

Gas-insulated vs. air-insulated switchgear: how to choose

Gas-insulated switchgear seals live parts in gas for a compact, low-maintenance lineup; air-insulated switchgear stays larger but fully serviceable and gas-free. The right choice turns on footprint, environment, voltage class, and tightening SF6 rules.

View

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Customer support

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