DLM1 series Moulded Case Circuit Breakers (hereinafter referred to as Circuit Breakers) are suitable for use in power distribution networks with AC 50Hz (or 60Hz), rated insulation voltage of 800V, rated working voltage of 690V and below, and rated current up to 1250A, and are used as electrical equipments for distribution of electric energy and protection of overload, under-voltage and shortcircuit protection of wiring and power supply equipments.
The Circuit Breakers with 630A shell frame rating or below can also be used as overload, under-voltage and short-circuit protection of electric motor. The Circuit Breakers can also be used as overload, undervoltage and short-circuit protection for electric motors.
Under normal conditions, they can also be used for infrequent switching of lines and infrequent starting of motors.
According to its rated ultimate short-circuit breaking capacity, the circuit breaker is divided into three types: L-type (standard type), M-type (higher breaking type) and H-type (high breaking capacity type).
DLM1 series Moulded Case Circuit Breakers (hereinafter referred to as Circuit Breakers) are suitable for use in power distribution networks with AC 50Hz (or 60Hz), rated insulation voltage of 800V, rated working voltage of 690V and below, and rated current up to 1250A, and are used as electrical equipments for distribution of electric energy and protection of overload, under-voltage and shortcircuit protection of wiring and power supply equipments.
The Circuit Breakers with 630A shell frame rating or below can also be used as overload, under-voltage and short-circuit protection of electric motor. The Circuit Breakers can also be used as overload, undervoltage and short-circuit protection for electric motors.
Under normal conditions, they can also be used for infrequent switching of lines and infrequent starting of motors.
According to its rated ultimate short-circuit breaking capacity, the circuit breaker is divided into three types: L-type (standard type), M-type (higher breaking type) and H-type (high breaking capacity type).
The Circuit Breaker is characterized by small size, high breaking capacity, short flying arc, anti-vibration and so on.
The Circuit Breaker can be installed vertically (i.e. vertically mounted) or horizontally (i.e. horizontally mounted).
The Circuit Breaker conforms to: IEFC60947-2, GB14048.2 standard.
Model
Note:
According to the rated ultimate short-circuit breaking capacity of
the product is divided into: L-type (standard), M-type (higher breaking type), H-type (high breaking type).
No code for handle direct operation; Electric operation is indicated by P; Rotating handle is indicated by Z.
No code for circuit breaker for power distribution; Motor protection is indicated by 2.
According to the number of poles of the product is divided into 3 pole and 4 pole. There are four types of neutral pole (N pole) in four-pole products.
Type A: N-pole is not installed with over-current tripter. and N-pole is always on, not split or closed with other three poles.
Type B: N-pole is not installed with over-current tripter, N-pole and the other 3 poles split or closed together (N-pole first closed and then split).
Type C: N pole is installed with over-current tripter, and N pole is split or closed with other 3 poles (N pole is closed first and then split).
Type D: N-pole is installed with over-current tripter, and N-pole is alwavs on, not split or closed with the other three poles.
The Normal Working Conditions And Installaticn Conditions
Altitude: <2000m;
Maximum inclination is 22.5°;
Ambient temperature: -5℃~ +40℃;
In a medium with no danger of explosion, and the mediumis not sufficiently corrosive;
Withstand the effects of humid air;
Metal and insulation-destroying gases and conductive dust places;
Withstand the effects of salt spray and oil mist;
Where there is no rain or snow intrusion;
Pollution class 3;
Installation category ll.
Technical Parameters
Technical Parameters
Model Number
DLM1-63
DLM1-125
DLM1-250
DLM1-400
DLM1-630
DLM1-800
Electric characteristics as per IEC 60947-2, EN 60947-2
Rated current (A) In 40℃
10, 16, 20, 25, 30, 32, 40, 50, 63
25, 30, 32, 40, 50, 63, 80, 100, 125
100, 125, 140, 150, 160, 175, 180, 200, 225, 250
250, 300, 315, 320, 350, 400
400, 450, 500, 630
630,700,800
Rated insulation voltage (V) Ui
800
800
800
800
800
800
Rated impulse withstand voltage (kV) Uimp
8
8
8
8
8
8
Code for breaking capacity
L
M
L
M
H
L
M
H
L
M
H
L
M
H
L
M
H
Rated ultimate short circuit breaking capacity (kA)
25
50
25
50
85
36
50
85
36
50
85
50
65
100
50
65
100
Rated service short-circuit breaking capacity (kA) 400V/690V
12.5
25
12.5
25
42.5
18
25
42.5
18
25
42.5
25
32.5
50
25
32.5
50
Rated service short-circuit breaking capacity Ics (%lcu)
100%
100%
100%
100%
100%
100%
Cat
A
Poles number
3,4
2, 3, 4
2, 3, 4
3,4
3,4
3,4
Maintainable mechanical life (times)
20000
20000
20000
10000
10000
10000
Electrical life(times)
3000
3000
3000
2000
2000
2000
Flying Arc Distance(mm)
≤50
≤50
≤50
≤100
≤50
≤50
Accessories
Dimensions
Height of electric operating mechanism
Model of circuit breaker for operating mechanism
DLM1-63L, M
DLM1-100L, M, H
DLM1-225L, M, H
DLM1-400L, M, H
DLM1-630L, M, H
DLM1-800M, H
Height(mm)
CD2 motor type
90.5
89.5
93
142
153
146
CD motor type
–
–
–
141
141
150
External accessories installation method and its overall dimensions
Note:
It is recommended to purchase the operating mechanism from our company at the same time when ordering. If the user purchases by himself, due to the quality of other companies of the operating mechanism of all the adverse consequences arising from the quality of the company will not be responsible for the company.
Installation of external accessories and their external dimensions
External Accessories
Model of External Accessories
Matching Circuit Breakers
Manual Mounting Dimensions (mm)
Mounting Method
H
A
B
A
B
Metal
Plastic
/
/
/
/
Manual Operating Mechanism
CD2-100/M
DLM1-100
49
69
104
30
/
/
Vertical Mounting
CD2-225/M
DLM1-225
55
72
143
35
/
/
CD2-400/M
DLM1-400
76
110
194
138
/
/
CD2-630/M
DLM1-630
83
110
200
168
/
/
CD2-100/M
DLM1-100
46
/
35
30
/
/
Vertical Mounting
CD2-100/M
DLM1-100
46
/
37
30
/
/
Horizontal Mounting
CD2-225/M
DLM1-225
48
/
35
31
/
/
Vertical Mounting
CD2-225/M
DLM1-225
48
/
45
32
/
/
Horizontal Mounting
CD2-400/M
DLM1-400
61
/
65
15
/
/
Vertical Mounting
CD2-630/M
DLM1-630
61
/
60
15
/
/
Solenoid
CDM3-100/M
DLM1-100
91
/
103.5
30
117.5
90
CDM3-225/M
DLM1-225
101
/
143
35
155
105
Electric Motor
CD-400/M
DLM1-400
141
/
226
132
/
/
CD-630/M
DLM1-630
140
/
226
132
/
/
Note: DLM1L-100~630 and DLM1E-100~630 are both universal DLM1-100~630 external accessories.
FAQ
1. What is an MCCB and when should I use it?
An MCCB (Molded Case Circuit Breaker) is used to protect electrical circuits from overload and short circuit conditions. Compared to MCBs, MCCBs offer higher current ratings and adjustable trip settings, making them ideal for industrial and commercial power systems.
2. What current ratings do your MCCBs cover?
Our MCCBs have current ratings ranging from 16A to 1600A, available in 1-pole, 2-pole, 3-pole, and 4-pole models. Depending on protection requirements, we also offer fixed-type(DLM1 Series)and adjustable-type models(DLM1E Series). For higher current values, you can also choose our Air Circuit Breakers, which have a current rating range of 630A to 6300A. Here is the product link for our Air Circuit Breakers: https://derlicn.com/product/dlm1e-adjustable-molded-case-circuit-breaker-mccb/
3. Are your MCCBs certified for export?
Yes, all our MCCBs comply with IEC/EN 60947-2 standards and carry CE certification. We can also provide test reports, CCC, or other certificates if required for your market.
4. How do I select the right MCCB for my application?
Key parameters include rated current (In), breaking capacity (Icu/Ics), pole configuration, trip unit type (thermal-magnetic or electronic), and installation environment. Our engineers can assist in selecting the appropriate model based on your system design. You can send your request to this email address (info@derlicn.com), or you can fill out the contact form on our product page.
5. What is the breaking capacity of your MCCBs?
We offer MCCBs with breaking capacities ranging from 10kA to 100kA, depending on voltage rating and enclosure size. For the DLM1 molded case circuit breaker, we have divided the models into two different types based on breaking capacity: L (standard breakingcapacity) and M (high breakingcapacity). The high-breaking models are suitable for demanding industrial applications. You can choose based on your specific requirement.
6. Do you supply both fixed and adjustable MCCBs?
Yes, we provide both types. Adjustable MCCBs allow fine-tuning of the overload protection setting, which is useful for systems with varying load conditions.Here is the product link for our adjustable MCCBs: https://derlicn.com/product/dlm1e-adjustable-molded-case-circuit-breaker-mccb/
7. What is your standard lead time for MCCBs?
For standard models, delivery can be arranged within 3-7working days. For custom-made items or bulk orders, lead time typically ranges from 15-25 days, depending on production schedule.
8. Do you keep popular MCCB models in stock?
Yes, we maintain stock for high-demand ratings such as 100A, 250A, 400A, and 630A in both 3P and 4P configurations. Please confirm availability with our sales team.
9. What is the minimum order quantity (MOQ)?
We support small-batch trial orders. For standard MCCBs, the MOQ is 1–10 units. For OEM orders or special configurations, the MOQ may range from 100 to 300 units, depending on your customisation requirements. Please consult our sales team for details.
10. Do you offer OEM or ODM customization?
Certainly. We provide comprehensive OEM/ODM services, including logo printing, packaging customisation, panel design modifications, and custom trip settings or housing colours for large orders. Additionally, we have professional technical staff who can support redesigns of the product’s internal structure, and we also support retooling.
11. What is your warranty policy for MCCBs?
We offer a standard 12-month warranty from the date of shipment. If issues arise due to product quality, we will provide free replacements or other technical solutions. Extended warranty periods may be negotiated for specific projects.
12. What materials do you use in your MCCBs?
Our MCCBs use flame-retardant thermoset molded cases, silver alloy contacts, and pure copper bus connections to ensure long-lasting durability and consistent performance.
13. Can I get datasheets?
Yes, we can provide comprehensive datasheets, dimension drawings, wiring diagrams. These can be sent in PDF formats upon request.Please contact our sales team for detailed datasheets (info@derlicn.com)
14. What payment terms do you accept?
We accept T/T and Alibaba Trade Assurance for online orders. Other options like PayPal can be considered for sample purchases.
15. Why choose your company as an AC contactor supplier?
We are an experienced manufacturer with over 14 years in the electrical field. Our strength lies in customized solutions, flexible MOQ, stable quality, and reliable lead times. With exports to 40+ countries, we understand what matters to professional buyers.
Can’t find an answer to your question, or want more information about our products? If so, please feel free to get in touch with our professional team. We’re here to help you drive your projects to success.
