1. Overview

The residual current operated circuit breaker of TZB/250(200).3N-K, which has the fuction of leakage protection, Short circuit and overload protection, it can improve performance of load switch in the low voltage power network terminal. Its reasonable structure and easy for install.

It has been recognized as the national Torch Program projects in China, and be widely used in the project of "Smart Gird" in the State Grid at China.

It conforms with the standards of IEC61009 and GB14048.2-2008.

2. Application

TZB/250(200).3N-K is applicable to a line of AC 50Hz/60Hz, rated voltage 380V for three phase four wire, neutral-point direct grounding low voltage distribution system. and rated current up to 250A. It can protect the line and motor from ground fault. It can also be used for indirect protect people from potentially deadly electrical shock hazards. It be wildly used for provide main and branch circuit protection for industrial and mining enterprises, distribution transformer.

3. Main Function

● Combined short-circuit and leakage protection into one product overcurrent

● Digital display the value of three-phase currents(Optional), voltage, leakage current and the maximum phase

● Adjust the overload protection value as the capacity of distribution transformer or the actual load (Optional)

● Automatically display the cause of cascading trip-out, fault phase and current

● Will send alerts once exceed the limit of leakage current, but not trip out when turn on the warning function

● Query-able for all previous tripping time(Optional), reasons.

● An intelligent tracking for line situation, or set operation value as period(Optional)

● Standard communication interface be builted-in for the automatic system of the power network

● Be able to identify and separate surge leakage current(Optional)

4. Model Description

TZB/□.3N-K

TZB: Residual Current operated circuit breaker.

□    : Rated current of frame

3N  : three phase four wire

H    : Application Code

5. Product Category

Basic/Type E: Protection for short circuit, overload and leakage.

Standard/Type D: Could adjust the current value of the overload

Surge/Type T: The current surge could be identified

Customization: Customized as clients' require

6. Techinical Data

Rated current: 160/200/250A

Rated voltage: 380V

Applicable circuit: AC 50Hz or 60Hz

Surge leakage  operation value: ≤50mA

Adjustable range of load current: 20~250A

Rated residual operating current: 75/100/150/200/300/500mA

Rated breaking time: ≤0.3S ≤0.5S

Dead time of reclosing: 20-60S

Rated residual non operating current: ≥1/2 I△n

ICU: 30KA

7. Overall & Installation Dimensions