DAM2 Moulded Case Circuit Breaker
DAM2 series the rated insulation voltage of the circuit breaker is 800V,it is suitable for the distribution network of AC 50Hz / 60Hz, rated working voltage of 690V and rated current of 1250A, to distribute power and protect circuit and power equipment from being damaged caused by overload , short-circuit, under-voltage and other fault. Also for protection infrequent conversion of the circuits and infrequent start of motor and overload, short circuit, under voltage. DAM2 circuit breaker can be mounted vertically (upright) or horizontally (transverse). DAM2 MCCB is suitable for isolation and the symbol is ” “. DAM2 MCCB meets the standard: IEC60947-2 “low-voltage switchgear and control equipment, Part 2: circuit breakers.”
Normal operating conditions
■ Ambient air temperature: -5℃~+40℃, and average temperature in 24h is below +35℃.
■ Altitude: The altitude of the installation site is not more than 2000m.
■ Atmospheric conditions: The air relative humidity in the highest temperature +40℃ is not more than 50%; In the low temperature can have higher relative humidity. The maximum average relative humidity is 90%, while the average monthly minimum temperature is +25℃, and consider the temperature changes in product on the surface of the gel.
■ Pollution Degree: 3.
Selection of instructions
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:
DAM2-63 MCCB has nine: 6,10,16,20,25,32,40,50,63 A;
DAM2-100 MCCB has nine: 16,20,25,32,40,50,63,80,100 A;
DAM2-250 MCCB has seven: 100,125,140,160,180,200,225 ,250A;
DAM2-400 MCCB has five: 225,250,315,350,400 A;
DAM2-630 MCCB has three: 400,500,630 A;
DAM2-800 MCCB has three: 630,700,800A;
DAM2-1250 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
1, Instantaneous action characteristic setting value of the circuit breaker for distribution is 10In±20%, DAM2-1250 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
|Model||Pole||Rated current (A)||Rated
|Rated ultimate short – circuit breaking capacity (Icu)||Flashover
|Test voltage (V)||Icu (kA)||Ics (kA)|
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
|No.||Test current||I/In||Set time||Initial state|
|1||Conventional non-tripping current||1.05||2h(In>63A)，1h(In≤63A)||Cold|
|2||Conventional non-tripping current||1.30||2h(In>63A)，1h(In≤63A)||Immediately after Test 1|
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
|No.||I/In||Set time||Initial state||Remark|
|2||1.2||≤2h||Immediately after Test 1|
|≤8min||225 < in ≤ 630|
|6s≤T≤20s||225 < in ≤ 630|
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
supply voltage Uc(DC24V)/Conductor area
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,
Special Note: The circuit breaker with undervoltage release, only in the under-voltage with rated voltage, which can open and close
1.3 Pre-paid meter dedicated release
The rated operating voltage Ue of the pre-paid meter dedicated release is AC230/50Hz, it can worknormally in the range of (65% ~ 110%) Ue. When the Ctrl is cut off, the circuit breaker will delay 0.5s ~ 2s to be opening.
Wiring diagram of pre-paid meter dedicated release
1.4 The rated value of auxiliary contacts and alarm contacts in Table 5
|Classification||Conventional thermal current (Ith)||Rated current whenAC 400V Ie(AC-15)||Rated current whenDC 220V Ie(DC-13)|
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.
|Category/Model||DAM2-63. 125. 250||DAM2-400. 630. 800. 1250|
|AC voltage code||AC50Hz、230V、400||AC50Hz、230V、400|
|DC voltage code||DC110V、220V||DC110V、220V|
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 DAM2-63、100、225 electric operating mechanism(AC)
The principle diagram of the opening and closing of DAM2-400、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 DAM2-63~800
Total height of electric/manual operating mechanism of circuit breaker (mm)(shown in Table 12)
|Model||Total height of electric
operating mechanism H
|Installation dimensionsof manual operating mechanism H|
How to fast Selection Table of DAM2 Series Molded Case Circuit Breaker
|Function name||Function corresponding to the model|
|a||Model features||DAM2 Molded CaseCircuit Breaker|
|b||Frame rated current code||63A、100A、225A、400A、630A、800A、
|c||Breaking capacity characteristic
|L-standard breaking type;M-second high breaking type;
H-high breaking type
|d||Operation mode code||No code for handle operation;P for electric operation;
Z for turning handle operation
|e||Pole||2-two poles;3-three poles;
|f||Release name||2 Electromagnetic release;3 Double release|
|g||Accessory||00 Without accessory
08 Alarm contact
10 Shunt release
20 Auxiliary contact
30 Undervoltage release
40 Shunt release, Auxiliary contact
50 Shunt release, Undervoltage release
60 Two sets of auxiliary contacts
70 Auxiliary contact, Undervoltage release
18 Shunt release, Alarm contact
28 Auxiliary contact, Alarm contact
38 Undervoltage release, Alarm contact
48 Shunt release, Auxiliary contact, Alarm contact
58 Shunt release, Undervoltage release, Alarm contact
68 Two sets of auxiliary contacts, Alarm contact
78 Auxiliary contact, Undervoltage release, Alarm contact
10Y Pre-paid meter dedicated release
40Y Pre-paid meter dedicated release, Auxiliary contact
50Y Pre-paid meter dedicated release, Auxiliary contact, Undervoltage release
18Y Pre-paid meter dedicated release, Alarm contact
48Y Pre-paid meter dedicated release, Auxiliary contact, Alarm contact
58Y Pre-paid meter dedicated release, Undervoltage release, Alarm contact
|h||Application||No code for distribution;2 for motor protection|
|i||Conventional products||No code;T for transparent cover products|
Example: DAM2L-100 / 33102 63A means DAM2-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.