| Customization: | Available |
|---|---|
| Breaking Capacity: | Low Voltage Circuit Breakers |
| Operation: | Manual Type |
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The DAM2 (CM1) series circuit breakers are engineered to perfection with a rated insulation voltage of 800V. Ideal for AC 50Hz/60Hz distribution networks with a working voltage of 690V and a rated current of up to 1250A, these breakers excel in power distribution and protection. They safeguard circuits and equipment from overloads, short-circuits, under-voltage, and other faults. Additionally, they facilitate infrequent circuit conversion and motor starts, offering comprehensive protection. The DAM2 MCCB can be installed both vertically and horizontally, making it versatile for any application. It is suitable for isolation, denoted by the symbol . Complying with IEC60947-2 standards, it sets the benchmark in low-voltage switchgear and control equipment.
1. Ambient air temperature: -5ºC to +40ºC, with an average temperature over 24 hours not exceeding +35ºC.
2. Altitude: Installation site should not exceed 2000 meters above sea level.
3. Atmospheric conditions: At +40ºC, relative humidity should not exceed 50%. Higher humidity is permissible at lower temperatures. The maximum average relative humidity is 90% at a minimum average monthly temperature of +25ºC, considering potential condensation effects on product surfaces.
4. Pollution Degree: 3.
Selection Instructions
Classified by pole configuration, the circuit breakers are available in four types:
Type A: N-pole without over-current release components, continuously connected, does not operate with the other three poles.
Type B: N-pole without over-current release components, operates in conjunction with the other three poles (N-pole engages prior to disengagement).
Type C: N-pole with over-current release components, operates in conjunction with the other three poles (N-pole engages prior to disengagement).
Classified by rated current of over-current release:
DAM2-63 MCCBavailable in nine ratings: 6, 10, 16, 20, 25, 32, 40, 50, 63 A.
DAM2-100 MCCBavailable in nine ratings: 16, 20, 25, 32, 40, 50, 63, 80, 100 A.
DAM2-250 MCCBavailable in seven ratings: 100, 125, 140, 160, 180, 200, 225, 250 A.
DAM2-400 MCCBavailable in five ratings: 225, 250, 315, 350, 400 A.
DAM2-630 MCCBavailable in three ratings: 400, 500, 630 A.
DAM2-800 MCCBavailable in three ratings: 630, 700, 800 A.
The DAM2-1250 MCCB offers three distinct amperage ratings: 800A, 1000A, and 1250A, ensuring versatile application in various electrical systems.
Remark: The 6A specification is solely available in the electromagnetic (instantaneous) type and is not recommended for most applications.
Classified by wiring method: wiring in front of the board, wiring on the back of the board, and insertion type of the board.
Based on over-current release patterns: thermodynamic-electromagnetic (dual) type and electromagnetic (instantaneous) type.
Available in two configurations: with outfit or without outfit, catering to different installation needs.
Outfit includes internal and external accessories: Internal accessories comprise shunt release, under-voltage release, auxiliary contact, and alarm contact. External accessories include a turning handle operation mechanism, power-driven operation mechanism, and more.
Breaking capacity options: L-standard breaking type; M-medium high breaking type; H-high breaking type.
1. Instantaneous action characteristic setting value for distribution circuit breakers is 10In±20%, DAM2-1250 at 7In±20%; for motor protection circuit breakers, it is 12In±20%.
2. The rated values of the circuit breaker are detailed in Table 2.
3. At an ambient temperature of +40ºC, the over-current release action characteristics for distribution circuit breakers are presented in Table 3, and for motor protection circuit breakers in Table 4.
Rated Value of the Circuit Breaker
| Model | Pole | Rated current (A) | Rated operating voltage (V) |
Rated insulation voltage (V) |
Rated ultimate short - circuit breaking capacity (Icu) | Flashover distance(mm) |
||
| Test voltage (V) | Icu (kA) | Ics (kA) | ||||||
| DAM2L-63 | 3 | 10,16,20,25, 32,40,50,63 |
400 | 500 | 400×1.10 | 25 | 18 | 0 |
| DAM2M-63 | 3,4 | 50 | 35 | |||||
| DAM2L-100 | 3,4 | 16,20,25,32,40, 50,63,80,100 |
400 | 800 | 30 | 22 | ≤50 | |
| DAM2M-100 | 2,3,4 | 50 | 35 | |||||
| DAM2H-100 | 3 | 85 | 50 | |||||
| DAM2L-100 | 3,4 | 690 | 10 | 5 | ||||
| DAM2M-100 | 2,3,4 | 20 | 10 | |||||
| DAM2L-225 | 3,4 | 100,125,140, 160,180,200,225 |
400 | 800 | 35 | 25 | ||
| TXCM1-225 | 2,3,4 | 50 | 35 | |||||
| DAM2H-225 | 3 | 85 | 50 | |||||
| DAM2L-225 | 3,4 | 690 | 10 | 5 | ||||
| DAM2M-225 | 2,3,4 | 20 | 10 | |||||
| DAM2L-400 | 3 | 225,250,315, 350,400 |
400 | 800 | 50 | 35 | ≤100 | |
| DAM2M-400 | 3,4 | 65 | 42 | |||||
| DAM2H-400 | 3 | 100 | 65 | |||||
| DAM2L-400 | 3 | 690 | 15 | 8 | ||||
| DAM2M-400 | 3,4 | 20 | 10 | |||||
| DAM2L-630 | 3 | 400,500,630 | 400 | 800 | 50 | 35 | ||
| DAM2M-630 | 3,4 | 65 | 42 | |||||
| DAM2H-630 | 3 | 100 | 65 | |||||
| DAM2L-630 | 3 | 6910 | 15 | 8 | ||||
| DAM2M-630 | 3,4 | 20 | 10 | |||||
| DAM2M-800 | 3 | 630,700,800 | 400 | 800 | 75 | 50 | ||
| DAM2H-800 | 3 | 100 | 65 | |||||
| DAM2M-800 | 3 | 4690 | 30 | 15 | ||||
| DAM2-1250 | 3 | 800,1000,1250 | 400 | 800 | 85 | 42 | ||
| DAM2-1250 | 3 | 690 | 25 | 12.5 | ||||
Note: For 2-pole and 4-pole circuit breakers, categorized into L, M, and H types, all have the same breaking index as the M-type.
Inverse time breaking action characteristics of circuit breakers' over-current release for power distribution when all poles are simultaneously powered.
| 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 for distribution circuit breakers is 10In±20%, while for motor protection circuit breakers it is 12In±20%.
Inverse time breaking action characteristics of circuit breakers' over-current release for motor protection when all poles are simultaneously powered.
| No. | I/In | Set time | Initial state | Remark |
| 1 | 1.0 | >2h | Cold | |
| 2 | 1.2 | ≤2h | Immediately after Test 1 | |
| 3 | 1.5 | ≤4min | Cold | 10≤n≤225 |
| ≤8min | 225 < in ≤ 630 | |||
| 4 | 7.2 | 4s≤T≤10s | Cold | 10≤In≤225 |
| 6s≤T≤20s | 225 < in ≤ 630 |
Accessories
1. Internal Accessories of Circuit Breakers
1.1 Shunt Release
The rated control supply voltage for the shunt release: AC 50Hz, 230V, 400V; DC 110V, 220V, 24V. Reliable circuit breaker operation within 70%~110% voltage.
For DC24V rated control supply voltage, ensure the maximum length of copper wire adheres to the following requirements:
| Rated control supply voltage Uc(DC24V)/Conductor area |
1.5mm² | 2.5mm² |
| 100%Uc 85%Uc |
150m 100m |
250m 160m |
If the table requirements are not met, design the shunt release control circuit as illustrated below.
1.2 Under-voltage Release
When supply voltage drops to 70%-35% of the rated voltage, the under-voltage release will reliably break the circuit breaker.
If the supply voltage falls below 35% of the rated voltage, the under-voltage release prevents the circuit breaker from closing.
When supply voltage exceeds 85% of the rated voltage, the under-voltage release ensures the circuit breaker closes.
These under-voltage releases are rated at AC 50Hz, 230V, 400V.
400V.
Special Note: Circuit breakers with under-voltage release can only open and close normally when the under-voltage is at the rated voltage.
normally.
1.3 Pre-paid Meter Dedicated Release
The rated operating voltage (Ue) for the pre-paid meter dedicated release is AC230V/50Hz, functioning efficiently within a range of 65% to 110% Ue. Upon disconnection of the control (Ctrl), the circuit breaker will delay for 0.5 to 2 seconds before opening.
Wiring Diagram for Pre-paid Meter Dedicated Release
1.4 Rated Values of Auxiliary and Alarm Contacts (See Table 5)
| Classification | Conventional thermal current (Ith) | Rated current when
AC 400V Ie(AC-15) |
Rated current when
DC 220V Ie(DC-13) |
| Auxiliary contact | 3 | 0.4 | 0.15 |
| Alarm contact | 3 | 0.3 | 0.15 |
a. Auxiliary Contact
b. Alarm Contact
Alarm contacts do not activate during normal opening and closing of the circuit breaker; they switch from normally open to normally closed only after tripping due to a fault or free tripping.
2. External Accessories for Circuit Breakers
2.1 Motor Operating Mechanism: Rated values and codes are detailed in Table 6.
| Category/Model | DAM2-63. 125. 250 | DAM2-400. 630. 800. 1250 |
| Structure type | Electromagnet | Motor |
| AC voltage code | AC50Hz,230V,400 | AC50Hz,230V,400 |
| DC voltage code | DC110V,220V | DC110V,220V |
NOTE: Post-tripping of a circuit breaker with an electric operating mechanism requires the mechanism to re-engage the circuit breaker before it can close.
Principle Diagram for Opening and Closing of DAM2-63, 100, 225 Electric Operating Mechanism (AC)
Principle Diagram for Opening and Closing of DAM2-400, 630, 800, 1250 Electric Operating Mechanism (AC)
2.2 Installation Dimensions of Manual Operating Mechanism (Refer to Table 10)
Diagram: Handle Mounting Hole for DAM2-63 to 800
Total Height of Electric/Manual Operating Mechanism for Circuit Breaker (mm) (Refer to Table 12)
| Model | Total height of electric operating mechanism H |
Installation dimensions
of manual operating mechanism H |
| DAM2L-63 | 155 | 49 |
| DAM2M/H-63 | 164 | 49 |
| DAM2L-100 | 152 | 51 |
| DAM2M/H-100 | 170 | 51 |
| DAM2L-225 | 182 | 54 |
| DAM2M/H-225 | 199 | 54 |
| DAM2L/M/H-400 | 255 | 88 |
| DAM2M/H-630 | 262 | 89 |
| DAM2M/H-800 | 261 | 96 |
| DAM2H-1250 | 290 | 103 |
Quick Selection Guide for DAM2 Series Molded Case Circuit Breaker
| Corresponding letters |
Function name | Function corresponding to the model |
| a | Model features | DAM2 Molded Case
Circuit Breaker |
| b | Frame rated current code | 63A,100A,225A,
400A,630A,800A, 1250A |
| c | Breaking capacity characteristic code |
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; 4-four 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 |
| j | Amperage | 10,16,20,25,32,63,80,100,125,160,180,200 ,225,250,315,350,400,500,630,700,800,1000 ,1250 |
Example: DAM2L-100 / 33102 63A stands for a DAM2-type molded case circuit breaker, with a frame rated current of 100A, standard type breaking capacity, handle operation, 3 poles, double release, shunt release for motor protection, and a rated current of 63A.
Ensure selection, installation, and usage adhere to the product manual or relevant national standards.
Note: The N-pole type of a 4P circuit breaker is categorized into A-type or B-type. If unspecified, it defaults to B-type.
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