MCCB Tester Information
General Description and Features The MCCB tester is a programmable, high-current source designed specifically for testing molded-case circuit breakers as well as thermal, magnetic, or solid-state overload motor-protection relays.
MCCB Timer The tester built-in timer can test the time-delay characteristics of protection relays and molded-case circuit breakers. Once the test is initiated, the current source and the timer are automatically turned on at the next zero-crossing point of the AC. The timer stops when the device input detects a change in the dry contact or voltage input, or detects the removal of the test current. The test results are then displayed in milliseconds and fractions of a cycle(s) on the unit’s back-lit LCD screen (20 characters by 4 lines).
MCCB-250 Current Source The device has 4 current-source outputs (5 A @ 120 Vac, 25 A @ 24 Vac, 120 A @ 6 Vac, 250 A @ 3 Vac) that conduct the test current through the high-impedance load circuits. Each current source can tolerate short-duration over-loads up to 4 times the rated current. This feature is used for testing the instantaneous trip element of molded-case circuit breakers. When using this feature, the selected test current is displayed on the LCD screen. When it is used as a current source, the current-flow time (the current-on period) is displayed on the LCD screen.
External Current Input This device also provides an external current input (0 – 10 A). Both internal and external current source readings can be viewed at the same time.
AC Current source The tester provides five AC current outputs (items 1, 2, 3, 4, and 5 in Figure 1). AC test current is set by the current control knob. This test current is measured and displayed on the LCD screen. The device’s output current ratings are shown in Table 3 and Table 4 below.
Table 3. Current Output
CURRENT OUTPUT 120 Vac @ 5 A 24 Vac @ 25 A 6 Vac @ 120 A 3 Vac @ 250 A
Table 4 . Overload Current Output
CURRENT - ON TIME - OFF TIME 100%(1x) - 30 Minutes - 30 Minutes 200%(2x) - 3 Minutes - 5 Minutes 300%(3x) - 30 Seconds - 4 Minutes 400%(4x) - 4 Seconds - 7 Minutes
Current Output Control The tester current source output is controlled by the up arrow and down arrow keys. Three control modes are available: ON+TMR, OFF, and MOMT. The OFF mode indicates that both the current source output and timer are off. The MOMT mode turns on the current source momentarily. To turn on the current source, press and hold the down arrow key. The LED indicator next to the “MOMT” label will turn on indicating that the device current source is on. The output current will also be displayed on the LCD screen. Its current output can now be set by turning the current control knob. Release the down arrow key to turn off the current source. The ON+TMR mode turns on the MCCB tester current source and timer. This initiates a test and is stopped by using the timer stop inputs. The test results will be displayed on the LCD screen. The test can also be terminated by pressing the down arrow key.
This content has been taken from http://www.ideamarketers.com/library/article.cfm?articleid=3436453
The company which manufactures electrical equipment for measurement and maintenance of electrical substations offers customers reliable equipment. We have a wide range of products like micro ohm meter, power analyzers, relay tester, transformer test equipment or test equipment for relays. For further information about circuit breaker tester, please visit us online.
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The company which manufactures electrical equipment for measurement and maintenance of electrical substations offers customers reliable equipment. We have a wide range of products like micro ohm meter, power analyzers, ultrasonic leak detector, transformer test equipment or test equipment for relays. For further information about circuit breaker tester, please visit us online at http://www.amperis.com/en/products/microhmmeters/.
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