Megger CB-845 Circuit Breaker Test Set

Brand: Megger

SKU: 5098

The Megger CB-845 is a lightweight, two-section high-current circuit-breaker test set delivering up to 10 kA of primary injection with a 3½-digit LED ammeter, for testing low-voltage breakers in the field.

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Description

Megger CB-845 Circuit Breaker Test Set

The lightweight, two-section design of the Megger CB-845 lets the user easily transport a high-current test set into areas previously inaccessible to such equipment — elevated or subsurface load centres, shipboard power panels, elevator machinery rooms and other isolated locations. It provides high-current primary injection up to 10 kA with a bright 3½-digit LED ammeter for accurate current measurement, making it a practical solution for primary-injection testing of low-voltage moulded-case and power circuit breakers.

Key features of the Megger CB-845 test set

High-current output – switch-selected ranges to 10 kA (0–19.99 / 199.9 / 1999 A / 10 kA) for primary-injection breaker testing.
Two-section, portable design – separate control and output units for easier transport into hard-to-reach locations.
Bright digital ammeter – 3½-digit, extra-bright LED display with 7.62 mm numerals.
Dependable accuracy – overall ammeter accuracy of ±1% of reading ±1 digit.
Flexible supply – switch-selected 208/240 V, single-phase, 30 A input; 50 Hz or 60 Hz.

Megger CB-845 applications

Primary-injection testing of low-voltage moulded-case and power circuit breakers.
Verifying breaker trip characteristics in load centres and panels.
Field testing in shipboard, elevated and subsurface locations.

What’s in the box – Megger CB-845

CB-845 control unit and output unit
Interconnection and output cables
Documentation

Specify 50 Hz or 60 Hz when ordering; exact cables/accessories vary by order — confirm with MME.

Why buy the Megger CB-845 from MME in UAE

MOHAMMAD MAHDI Electronics Trading LLC (MME) supplies genuine Megger circuit-breaker test equipment across the UAE and the GCC, with application support and after-sales service. Contact MME for pricing and availability of the CB-845 test set.

Specifications

Category	Specification	Details
Input	Input Voltage (switch-selected)	208 and 240 V, 1f, 30 A
Input	Input Frequency (specify one)	50 Hz OR 60 Hz
Output	Output Range	The output is continuously adjustable to accommodate a variety of test circuit impedances: 0 to 1200 A at 6 V max.
	Output Capacity	The output circuit is designed to provide short-duration overloads. Capable of testing time-delay characteristics of devices rated up to 500 A using a test current of three times their rating (1500 A). For instantaneous trip tests, provides 5000 A through a typical 500 A molded-case circuit breaker.
	Overload Capability	Designed so that current ratings may be exceeded for short durations. Output current determined by load circuit impedance and voltage rating.
Output Initiate	Initiate Circuit	The test set uses a solid-state output initiating circuit using a triac to increase reliability and eliminate contact maintenance.
Output Initiate	Control Circuit	Provides momentary and maintained modes to control output duration. Used for short durations or maintained until manually turned off or the device under test operates.
Timer	Description	A solid-state digital timer measures elapsed time in seconds or cycles, using a crystal controlled oscillator for accuracy independent of line frequency.
Display	Type	5-digit, extra-bright LED display with 0.3 in. (7.62 mm) numerals
Accuracy and Ranges	Ranges (switch-selected)	0 to 99.999 s, 0 to 999.99 s, 0 to 99999 cycles
	Accuracy	±0.005% of reading, ±1 digit

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1 review for Megger CB-845 Circuit Breaker Test Set

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sam – October 26, 2025

Rated 5 out of 5
The Megger Cb-845 is a reliable and efficient circuit breaker test set that has greatly improved our testing process!

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Megger CB-845 Circuit Breaker Test Set

Megger CB-845 Circuit Breaker Test Set

Key features of the Megger CB-845 test set

Megger CB-845 applications

What’s in the box – Megger CB-845

Why buy the Megger CB-845 from MME in UAE

Specifications

1 review for Megger CB-845 Circuit Breaker Test Set

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