| Customization: | Available |
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| Breaking Capacity: | Low Voltage Circuit Breakers |
| Operation: | Manual Type |
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The DAM2 (CM1) series MCCB boasts a rated insulation voltage of 800V. It is designed for AC distribution networks of 50Hz / 60Hz, with a rated working voltage of 690V and a rated current of up to 1250A. This breaker excels in power distribution and protecting circuits and equipment from damage caused by overload, short-circuit, under-voltage, and other electrical faults. Additionally, it supports infrequent circuit conversions, motor startups, and isolation. The DAM2 MCCB can be installed both vertically and horizontally, adhering to the IEC60947-2 standard for low-voltage switchgear and control equipment, Part 2: circuit breakers.
1. Ambient air temperature: -5ºC to +40ºC, with a 24-hour average not exceeding +35ºC.
2. Altitude: Installation site altitude should not exceed 2000m.
3. Atmospheric conditions: At a peak temperature of +40ºC, relative humidity should not exceed 50%. Higher humidity levels are permissible at lower temperatures, with a maximum average relative humidity of 90% when the monthly average of the minimum temperature is +25ºC. Temperature variations must be considered for product surface condensation.
4. Pollution Degree: 3.
Selection Instructions
Poles Classification:
Type A: N-pole without over-current release components; N-pole remains connected and does not activate with the other three poles.
Type B: N-pole without over-current release components; N-pole activates with the other three poles, turning on prior to turning off.
Type C: N-pole with fixed over-current release components; N-pole activates with the other three poles, turning on prior to turning off.
Classification by Rated Current of Over-Current Release:
DAM2-63 MCCB offers ratings of 6, 10, 16, 20, 25, 32, 40, 50, and 63 A;
DAM2-100 MCCB offers ratings of 16, 20, 25, 32, 40, 50, 63, 80, and 100 A;
DAM2-250 MCCB offers ratings of 100, 125, 140, 160, 180, 200, 225, and 250 A;
DAM2-400 MCCB offers ratings of 225, 250, 315, 350, and 400 A;
DAM2-630 MCCB offers ratings of 400, 500, and 630 A;
DAM2-800 MCCB offers ratings of 630, 700, and 800 A;
DAM2-1250 MCCB offers ratings of 800, 1000, and 1250 A.
Remark: The 6A only comes in the electromagnetic (instantaneous) type and is not a recommended specification.
Wiring Methods: Front-of-board wiring, back-of-board wiring, and insertion type of the board.
Over-Current Release Patterns: Thermodynamic-electromagnetic (dual) type and electromagnetic (instantaneous) type.
Outfit Options: Available with or without an outfit.
Outfit Components: Inner accessories include shunt release, under-voltage release, auxiliary contact, and alarm contact. Outer accessories encompass turning handle operation mechanism and power-driven operation mechanism, among others.
Breaking Capacity: L-standard breaking type, M-second high breaking type, and H-high breaking type.
1. Instantaneous Action Characteristics: For distribution circuit breakers, the setting value is 10In±20%, while for DAM2-1250 it is 7In±20%. For motor protection circuit breakers, the setting value is 12In±20%.
2. Rated Values: Refer to Table 2 for the rated values of the circuit breakers.
3. Over-Current Release Action Characteristics: At +40ºC ambient temperature, refer to Table 3 for distribution circuit breakers and Table 4 for motor protection circuit breakers.
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 (L, M, H types), the breaking index matches that of M-type.
Inverse Time Breaking Action: Characteristics of inverse time breaking action for power distribution circuit breakers when each pole is energized simultaneously.
| 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 Setting Values: For distribution circuit breakers, the setting value is 10In±20%. For motor protection circuit breakers, the setting value is 12In±20%.
Inverse Time Breaking Action: Characteristics for motor protection circuit breakers when each pole is energized simultaneously.
| 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 for Circuit Breakers
1.1 Shunt Release
Rated Control Supply Voltage for Shunt Release: AC50Hz, 230V, 400V; DC110V, 220V, 24V. Reliable circuit breaker operation is ensured when within 70%-110% voltage range.
For DC24V Shunt Release: Maximum length of copper wire must meet specified requirements.
| Rated control supply voltage Uc(DC24V)/Conductor area |
1.5mm² | 2.5mm² |
| 100%Uc 85%Uc |
150m 100m |
250m 160m |
If requirements are unmet, refer to the recommended shunt release control circuit diagram.
1.2 Under-Voltage Release
Operation Range: When power supply voltage drops to 70%-35% of rated voltage, the under-voltage release ensures circuit breaker disconnects reliably.
Below 35% Voltage: The under-voltage release prevents the circuit breaker from closing.
Above 85% Voltage: The under-voltage release ensures the circuit breaker closes effectively. Rated at AC50Hz, 230V, 400V.
Special Note: Circuit breakers with undervoltage release can only operate normally within the rated voltage range.
1.3 Pre-Paid Meter Dedicated Release
The rated operating voltage (Ue) of our pre-paid meter dedicated release is AC230/50Hz, seamlessly operating within a range of 65% to 110% Ue. In the event of Ctrl being cut off, the circuit breaker will delay opening for a period ranging from 0.5s to 2s.
Intricate Wiring Diagram of Pre-Paid Meter Dedicated Release
1.4 Detailed Rated Values of Auxiliary Contacts and Alarm Contacts in 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. Comprehensive Specifications of Auxiliary Contact
b. Detailed Configuration of Alarm Contact
Alarm contacts remain inactive during regular opening and closing of the circuit breaker. They switch between normal open and normal close positions only after free tripping or fault tripping, ensuring reliable performance.
2. Extensive Range of External Accessories for Circuit Breakers
2.1 Motor Operating Mechanism: Precise Rated Values and Codes as Shown 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 the circuit-breaker equipped with an electric operating mechanism necessitates the mechanism to buckle the circuit-breaker again before it can be closed, ensuring secure operations.
Comprehensive Principle Diagram for Opening and Closing of DAM2-63,100,225 Electric Operating Mechanism (AC)
Detailed Principle Diagram for Opening and Closing of DAM2-400,630,800,1250 Electric Operating Mechanism (AC)
2.2 Precise Installation Dimensions of Manual Operating Mechanism as Shown in Table 10
Accurate Diagram of Handle Mounting Hole for DAM2-63~800
Total Height Specifications of Electric/Manual Operating Mechanism of Circuit Breaker (mm) as Shown in 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 Reference Selection Table 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 signifies a DAM2-type molded case circuit breaker with a frame rated current of 100A, standard breaking capacity, handle operation, 3 poles, double release, with shunt release, designed for motor protection with a rated current of 63A.
Selection, installation, and usage must strictly adhere to the product manual or relevant national standards for optimal performance.
Note: The N-pole type of 4P circuit breaker is categorized into A-type and B-type, with B-type being the default unless specified otherwise.
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