Audited Supplier
The DAM2 series Moulded Case Circuit Breaker represents the pinnacle of advanced circuit breaker technology, designed meticulously by Shanghai DaDa Electric Co., Ltd. Boasting a compact size, exceptional breaking capacity, minimal arc-over distance, and robust shakeproof features, these circuit breakers are the perfect solution for both land-based and marine applications.
Application
The DAM2 (CM1) series, with a rated insulation voltage of 800V, is engineered for AC 50Hz/60Hz distribution networks, supporting a working voltage of 690V and a current of up to 1250A. These breakers safeguard against overloads, short circuits, under-voltage, and other faults, ensuring the protection of circuits and power equipment. Suitable for both infrequent circuit conversions and motor starts, the DAM2 series can be installed vertically or horizontally and serves as an isolation unit. It adheres to the IEC60947-2 standard for low-voltage switchgear and control equipment.
Normal operating conditions
1. Ambient air temperature: -5ºC to +40ºC, with a maximum 24-hour average below +35ºC.2. Altitude: Installation sites must not exceed an altitude of 2000m.
3. Atmospheric conditions: Maximum relative humidity of 50% at +40ºC, higher humidity permissible at lower temperatures. Average monthly relative humidity can reach 90% at +25ºC, accounting for temperature-induced condensation.
4. Pollution Degree: 3.
Selection of instructions
Circuit breakers are classified into four types based on their poles:
Type A: N-pole without over-current release components, always connected, and does not engage with the other three poles to switch on or off.
Type B: N-pole without over-current release components, engages with the other three poles (N-pole turns on before and off after the others).
Type C: N-pole equipped with over-current release components, engages with the other three poles (N-pole turns on before and off after the others).
Classification according to rated current of over-current release:
DAM2-63 MCCB offers nine options: 6, 10, 16, 20, 25, 32, 40, 50, and 63 A. MCCB has nine: 6,10,16,20,25,32,40,50,63 A;
DAM2-100 MCCB offers nine options: 16, 20, 25, 32, 40, 50, 63, 80, and 100 A. MCCB has nine: 16,20,25,32,40,50,63,80,100 A;
DAM2-250 MCCB offers seven options: 100, 125, 140, 160, 180, 200, 225, and 250 A. MCCB has seven: 100,125,140,160,180,200,225 ,250A;
DAM2-400 MCCB offers five options: 225, 250, 315, 350, and 400 A. MCCB has five: 225,250,315,350,400 A;
DAM2-630 MCCB offers three options: 400, 500, and 630 A. MCCB has three: 400,500,630 A;
DAM2-800 MCCB offers three options: 630, 700, and 800 A. MCCB has three: 630,700,800A;
DAM2-1250 MCCB offers three options: 800, 1000, and 1250 A.
Remark: The 6A variant features solely an electromagnetic (instantaneous) type, hence, it is not recommended.
According to the wiring method: front board wiring, back board wiring, and insertion type.
Over-current release patterns: thermodynamic-electromagnetic (dual) type and electromagnetic (instantaneous) type.
Outfit options: available with or without outfit.
Outfit includes both internal and external accessories. Internal accessories comprise shunt release, under-voltage release, auxiliary contact, and alarm contact. External accessories feature turning handle operation mechanisms and power-driven operation mechanisms, among others.
Breaking capacity classifications: L-standard breaking type, M-second high breaking type, H-high breaking type.
Technical parameters:
1. Instantaneous action characteristic setting: For distribution circuit breakers, it is 10In±20%; for DAM2-1250, it is 7In±20%. For motor protection circuit breakers, it is 12In±20%.
2. The rated values of the circuit breakers are detailed in Table 2.
3. At an ambient temperature of +40ºC, over-current release action characteristics for distribution and motor protection circuit breakers are detailed in Tables 3 and 4, respectively.
Rated values of the circuit breakers:
| 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 as L, M, H, the breaking index aligns with M-type.
Characteristics of inverse time breaking action for power distribution circuit breakers' over-current release when all poles are 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 characteristic setting for distribution circuit breakers is 10In±20%, and for motor protection circuit breakers, it is 12In±20%.
Characteristics of inverse time breaking action for motor protection circuit breakers' over-current release when all poles are powered 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 of circuit breakers:
1.1 Shunt release:
Rated control supply voltage for shunt release: AC50Hz, 230V, 400V; DC110V, 220V, 24V. Ensures reliable circuit breaker operation within 70%~110% of rated voltage.
For a DC24V rated control supply voltage, the maximum length of copper wire must adhere to specified requirements:
| Rated control supply voltage Uc(DC24V)/Conductor area | 1.5mm² | 2.5mm² |
| 100%Uc 85%Uc | 150m 100m | 250m 160m |
If these specifications are not met, consider designing the shunt release control circuit according to the provided diagram.
1.2 Under-voltage release:
When power supply voltage drops to 70%~35% of under-voltage release rated voltage, the circuit breaker reliably disconnects.
If the voltage falls below 35% of the rated voltage, the under-voltage release prevents the circuit breaker from closing.
When the supply voltage exceeds 85% of the under-voltage release rated voltage, it ensures the circuit breaker remains closed.
Under-voltage releases are rated at AC50Hz, 230V and 400V.
400V.
Special Note: Circuit breakers with under-voltage release can only operate normally when supplied with the rated voltage.
normally.
1.3 Pre-paid meter dedicated release:
The rated operating voltage (Ue) of the pre-paid meter dedicated release is AC230/50Hz, ensuring reliable performance within a broad range of (65% ~ 110%) Ue. Upon the Ctrl being cut off, the circuit breaker will gracefully delay by 0.5s ~ 2s before opening.
Wiring Diagram: Pre-paid Meter Dedicated Release
1.4 Rated Values of Auxiliary Contacts and Alarm Contacts: Refer to 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: Detailed Specifications
b. Alarm Contact: Detailed Specifications
Alarm contacts remain inactive during normal circuit breaker operations, switching between normal open and closed states only in cases of free or fault tripping.
2. External Accessories for Circuit Breakers
2.1 Motor Operating Mechanism: Rated values and corresponding codes are outlined 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 reset the breaker before it can close again.
Principle Diagram: Opening and closing operation of DAM2-63,100,225 Electric Operating Mechanism (AC)
Principle Diagram: Opening and closing operation of DAM2-400,630,800,1250 Electric Operating Mechanism (AC)
2.2 Installation Dimensions: Manual Operating Mechanism as shown in Table 10
Handle Mounting Hole Diagram: DAM2-63~800
Total Height: 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 |
Fast Selection Guide: 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 defines a DAM2-type molded case circuit breaker with a frame rated at 100A, standard breaking capacity, handle operation, 3 poles, double release, shunt release, motor protection, and a rated current of 63A.
Selection, installation, and use must adhere to the product manual or pertinent national standards.
Note: For N-pole type 4P circuit breakers, A-type and B-type exist. Absence of specification defaults to B-type.
The primary contact of the molded case circuit breaker can be managed manually or electrically. Once closed, the free release mechanism secures the main contact in the closed position.
The overcurrent trip coil and thermal trip element are serially connected to the main circuit.
The undervoltage
release
coil is parallelly connected to the power supply.
