DLM1E Series Adjustable Moulded Case Circuit Breaker (MCCB) (hereinafter referred to as circuit breakers) are suitable for infrequent switching and infrequent starting of motor in circuits with AC 50Hz (or 60Hz), rated insulation voltage of 800V, rated working voltage of 690V and below, and rated working current of 800A.
The circuit breaker has overload long delay anti-time limit, short-circuit short delay anti-time limit, short-circuit short delay fixed-time limit, short-circuit instantaneous and under-voltage protection function as well as residual current protection (optional), phase-loss
protection function (optional), which can protect the line and power supply equipment from being damaged.
The protection characteristics of the circuit breaker are complete and accurate, which can improve the reliability of power supply and avoid unnecessary power outages, B” type control with communication interface, can be “four remote” to meet the requirements of the control center and automation system.
DLM1E series electronic MoldedCase Circuit Breakers (hereinafter referred to as circuit breakers) are suitable for infrequent switching and infrequent starting of motor in circuits with AC 50Hz (or 60Hz), rated insulation voltage of 800V, rated working voltage of 690V and below, and rated working current of 800A.
The circuit breaker has overload long delay anti-time limit, short-circuit short delay anti-time limit, short-circuit short delay fixed-time limit, short-circuit instantaneous and under-voltage protection function as well as residual current protection (optional), phase-loss
protection function (optional), which can protect the line and power supply equipment from being damaged.
The protection characteristics of the circuit breaker are complete and accurate, which can improve the reliability of power supply and avoid unnecessary power outages, B” type control with communication interface, can be “four remote” to meet the requirements of the control center and automation system.
The circuit breakers can not be inverted into the line, that is, only allows 1, 3, 5 connected to the power line, 2, 4, 6 connected to the load line.
The circuit breakers are divided into two types according to their rated ultimate short-circuit breaking capacity: L-type (standard type), M-type (higher breaking type) and H-type (high breaking type).
The Circuit Breaker is characterized by small size, high breaking capacity, short flying arc, anti-vibrationand 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
Notes:
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.
The Normal Working Conditions And Installation 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
DLM1-125
DLM1-250
DLM1-400
DLM1-630
DLM1-800
Current shell frame (A)
125
250
400
630
800
Setting current Ir1 (A)
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
Rated impulse withstand voltage(kV)Uimp
8
8
8
8
8
Code for breaking capacity
L
M
H
L
M
H
L
M
H
L
M
H
L
M
H
Rated ultimate short circuit breaking capacity (kA)
25
50
85
36
50
85
36
50
85
50
65
100
50
65
100
Rated service short-circuit breaking capacity (kA) 400V/690V
25
50
85
36
50
85
36
50
85
50
65
100
50
65
100
Rated service short-circuit breaking capacity Ics (%Icu)
100%
100%
100%
100%
100%
Cat
A
Poles number
3, 4
3, 4
3, 4
3, 4
3, 4
Mechanical life(times)
20000
20000
10000
10000
5000
Electrical life(times)
3000
3000
3000
1500
1000
Flying Arc Distance(mm)
≤50
≤50
≤50
≤100
≤50
Accessories
Adjustment knob for DLM1E series electronic circuit breaker
DLM1E series circuit breaker overload long delay inverse time current Ir1, long delay time t1, short-circuit short delay current r2, short delay time t2, short-circuit instantaneous current Ir3, pre-warning current r0 each adjusting knob is as follows.
Installation Method
Installation Method
Wiring in front of the board
X-X, Y-Y for three-stage breaker center
2. Shared excitation disconnectors
Connect to the power supply according to the number of the lead wire (DC power supply does not need to distinguish between positive and negative poles).
3. Auxiliary contact, alarm contact
According to the lead wire number access to the corresponding peripheral control circuits
Note: F11, F12, F14 for auxiliary contact terminals B11, B12, B14 for the alarm contact terminals.
FAQ
1. What is an adjustable MCCB and how does it differ from a fixed type?
An adjustable MCCB allows you to manually set the rated current and sometimes the short-time delay or instantaneous trip values. This offers flexibility for load protection, especially in dynamic or multi-load systems, unlike fixed MCCBs which have preset values.
2. What current ranges do your adjustable MCCBs cover?
We offer adjustable MCCBs ranging from 63A to 1600A, with common frame sizes including 100AF, 250AF, 400AF, 630AF, 800AF, and 1000AF. Each frame supports different current setting ranges based on application requirements.
3. Can I adjust the settings on site?
Yes, the trip unit is designed to be adjusted by qualified personnel. You can easily set overload protection and, in some models, adjust short-circuit trip thresholds to suit different operational needs.
4. What applications are adjustable MCCBs most suitable for?
They are ideal for industrial installations, motor feeders, main distribution panels, and scenarios where system loads vary or future expansions are expected. They help avoid nuisance tripping while still providing reliable protection.
5. Do you offer both thermal-magnetic and electronic trip units?
Yes. For adjustable MCCBs, we offer two options. Our DLSX series adjustable circuit breakers are equipped with thermal-magnetic trip units, while the DLM1E series adjustable circuit breakers feature electronic trip units. Compared to thermal-magnetic trip units, electronic trip units offer a wider range of settings, higher precision, and advanced protection features such as ground fault protection or communication interfaces.
6. What is the breaking capacity (Icu) of your MCCBs?
Our adjustable MCCBs offer breaking capacities ranging from 25kA up to 100kA at 415V AC, depending on the model and frame size. All meet IEC 60947-2 performance standards.
7. Are your products certified for international export?
Absolutely. We manufacture in full compliance with IEC/EN 60947-2. We can also provide CE or other certifications based on the requirements of the target market.
8. Can you provide technical data sheets?
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).
9. Do you keep adjustable MCCBs in stock?
We maintain inventory for commonly used models like 100A–630A, 3-pole versions with popular settings. For larger frame sizes or specific coil or trip settings, please check stock with our sales team.
10. What’s the typical lead time for production and delivery?
Standard models: 5–10 working days. Customized trip units, OEM labels, or special voltage coils: 15–25 working days. For urgent shipments, we offer expedited production depending on the order size.
11. What is your MOQ for adjustable MCCBs?
We support small quantity trial orders, starting from 1–10 pcs per model. For customized solutions or OEM production, the MOQ generally starts at 100 pcs per configuration.
12. Do you offer OEM/ODM services?
Yes. We provide full OEM/ODM services—logo printing, packaging, casing color, front panel redesign, even custom trip units. We support clients building their own brand in the electrical market.
13. What is your warranty and after-sales policy?
We offer a standard 12-month warranty from the date of shipment. During the warranty period, if any issues arise due to product quality, we will provide free technical support, spare parts, or replacement services based on the assessment results. Additionally, we can offer extended warranty services upon request.
14. What materials are used in your adjustable MCCBs?
We use flame-retardant thermoset casings, high-conductivity copper terminals, silver alloy contacts, and precision-engineered trip mechanisms to ensure product reliability under harsh working conditions.
15. Why choose your company as an MCCB supplier?
We are a trusted manufacturer with 14+ years of experience in exporting low-voltage switchgear. We combine stable quality, competitive pricing, flexible customization, fast response times, and strong R&D capabilities to support your business growth worldwide.
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.
