DAM2 Moulded Case Circuit Breaker

According to the pole, it classifies four types:
    Type A: N-pole without over-current release components, and N-pole has been connected all along, and does not act with other three poles to turn on or off;

    B-type: N-pole without over-current release components, and N-pole could act with other three poles (N-pole turn-on prior to turn-off);
    Type C: N-pole fixed with over-current release components, and N-pole could act with other three poles (N-pole turn-on prior to turn-off);

Classification according to rated current of over-current release:
DAM2(CM1)-63 MCCB has nine: 6,10,16,20,25,32,40,50,63 A;
DAM2(CM1)-100 MCCB has nine: 16,20,25,32,40,50,63,80,100 A;
DAM2(CM1)-250 MCCB has seven: 100,125,140,160,180,200,225 ,250A;
DAM2(CM1)-400 MCCB has five: 225,250,315,350,400 A;
DAM2(CM1)-630 MCCB has three: 400,500,630 A;
DAM2(CM1)-800 MCCB has three: 630,700,800A;
DAM2(CM1)-1250 MCCB has three: 800,1000,1250A.
Remark: 6A only has electromagnetic (instantaneous) type, is not recommended specifications.
According to the wiring method: wiring in front of board, wiring on back of board, insertion type of the board.
According to over-current release pattern: thermodynamic-electromagnetic (double) type, electromagnetic (instantaneous) type.
According to the outfit, it has two types: with or without outfit.
The outfit include inner accessories and outside accessories: The inner accessories have shunt release, under-voltage release, auxiliary contact and alarm contact. The outside accessories are turning handle operation mechanism, power-driven operation mechanism and so on.
According to the breaking capacity: L-standard breaking type; M-second high breaking type; H-high breaking type

Technical parameters

  1, Instantaneous action characteristic setting value of the circuit breaker for distribution is 10In±20%, DAM2(CM1)-1250 is 7In±20%; Instantaneous action characteristic set value of the circuit breaker for motor protection is 12In ± 20%.

2, The rated value of the circuit breaker in Table 2.3, In the ambient temperature of +40℃, the circuit breaker for distribution over-current release action characteristics shown in Table 3, the circuit breaker for motor protection over-current release action characteristics shown in Table 4.

Rated value of the circuit break

Note: 2-poles, 4-poles circuit breakers, divided into L, M, H, they have the same breaking index as M-type.

    Characteristics of inverse time breaking action of circuit breakers over-current release for power distribution when every pole is power-on at the same time

     Instantaneous action characteristic setting value of the circuit breaker for distribution is 10In±20%, and instantaneous action characteristic setting value of the circuit breaker for motor protection is 12In±20%.

     Characteristics of inverse time breaking action of circuit breakers over-current release for motor protection when every pole is power-on at the same time

Accessories Inverse time protection characteristic curve

Derating factors table of temperature changes

Outline and installation dimensions

Dimension of wiring in front of the board

1、Internal accessory of circuit breakers

1.1 Shunt release
Rated control supply voltage of the shunt release: AC50Hz, 230V, 400; DC110V, 220V, 24V; When between 70%~110%, can break the circuit breaker reliably.

    When rated control supply voltage of the shunt release is DC24V, the maximum length of copper wire should meet the following requirements.

If the requirements of the above table are not met, it is recommended to design the shunt release control circuit using the following figure

    If the requirements of the above table are not met, it is recommended to design the shunt release control circuit using the following figure

1.2 Under-voltage release

When the power supply voltage drops to under-voltage release rated voltage of 70% to 35% of the range, the under-voltage release circuit breaker reliable break; when the supply voltage is below the rated voltage undervoltage release 35%,Under-voltage release to prevent the circuit breaker is closed; when the supply voltage is higher than 85% of the rated voltage of the under-voltage release, the under-voltage release ensures that the circuit breaker is closed. The undervoltage releases are rated at AC50Hz, 230V,400V.
Special Note: The circuit breaker with undervoltage release, only in the under-voltage with rated voltage, which can open and close
normally.

1.3 Pre-paid meter dedicated release

1.4 The auxiliary contacts and alarm contacts 

a. Auxiliary contact

b. Alarm contact
Alarm contacts don’t act when the circuit breaker opens and closes normally, alarm contacts switch between normal opening and normal closing only after free tripping or fault tripping.

2、External Accessory for Circuit Breakers

 2.1 Motor operating mechanism. The rated value and code are shown in Table 6.

NOTE: After the tripping of circuit-breaker with electric operating mechanism, the electric operating mechanism must make the circuit-breaker buckle again, then it can close.

    The principle diagram of the opening and closing of DAM2(CM1)-63、100、225 electric operating mechanism(AC)

    The principle diagram of the opening and closing of DAM2(CM1)-400、630、800、1250 electric operating mechanism(AC)

2.2 Installation dimensions of manual operating mechanism shown in Table 10
Diagram of handle mounting hole of DAM2(CM1)-63~800

Total height of electric/manual operating mechanism of circuit breaker (mm)(shown in Table 12)

How to fast Selection Table of DAM2(CM1) Series Molded Case Circuit Breaker

 DAM2(CM1)-225 L P/3 3 10 2 T 200A

    Example: DAM2(CM1)L-100 / 33102 63A means DAM2(CM1)-type molded case circuit breaker, frame rated current is 100A, breaking capacity is the standard type, handle operation, 3 poles, double release, with shuntrelease, for motor protection, rated current is 63A.Selection, installation, use should be consistent with the product manual or the relevant national standards.
    Note: N-pole type of 4P circuit breaker is divided into A-type, B-type, which is not specified defaults to B type.