STE3 Series High-voltage DC contactor (Round Ceramic Sealing)
Product Features
■ Superior Protection
• Ceramic sealing + polarized load design (all models), rated for 1000VDC
■ High Surge Current Tolerance
• Short term withstand: e.g., STE3 250 handles 400A for 10min + 800A for 10s.
■ Energy Saving Operation
• Coil power: 45W pickup / 2.8W holding(>75% energy reduction).
■ Compact & Lightweight
• Minimal footprint
| Product model | Working voltage | Working current | Load polarity | Coil polarity | Auxiliary contact |
| STE3-50 | 1000 | 50 | Having polarity | Non-polarity | / |
| STE3-100 | 1000 | 100 | Having polarity | Non-polarity | / |
| STE3-150 | 1000 | 150 | Non-polarity | Non-polarity | 1NO |
| STE3-200 | 1000 | 200 | Non-polarity | Non-polarity | 1NO |
| STE3-250 | 1000 | 250 | Non-polarity | Non-polarity | 1NO |
| STE3-300 | 1000 | 300 | Non-polarity | Non-polarity | 1NO |
| STE3-350 | 750 | 350 | Non-polarity | Non-polarity | 1NO |
Technical Specifications
| Product model | STE3-50 | STE3-100 | |
| Contact form | 1H | 1H | |
| Auxiliary contact | / | / | |
| Contact polarity | Having polarity | Having polarity | |
| Contact resistance | ≤3mΩ(at 50A) | ≤3mΩ(at 100A) | |
| Operating voltage | ≤75%Un | ≤75%Un | |
| Maximum breaking current | 50A | 100A | |
| Electrical endurance | 10~1000V | 10~1000V | |
| Maximum breaking current | 1000A(300VDC) | 1000A(300VDC) | |
| Electrical endurance | 600 times(1000V,50A) | 500 times(1000V,50A) | |
| Current carrying | 50A:Continuous for 200A:10min 300A:10s |
100A:Continuous for 200A:10min 300A:10s |
|
| Dielectric withstand voltage | Between open contacts | 2500VAC | 2500VAC |
| Between contact coils | 2500VAC | 2500VAC | |
| Mechanical Endurance | 2×10⁵ times | 2×10⁵ times | |
| Coil Voltage | 12V,24V | 12V,24V | |
| Coil power consumption | 5.5W | 5.5W | |
| Load extraction method | Internal thread | Internal thread and screw | |
| Coil lead out method | lead wire | lead wire | |
| Weight | About 180g | About 180g | |
| Vibrate | 10Hz~500Hz 49m/s² | 10Hz~500Hz 49m/s² | |
| Humidity | 5%~85%RH | 5%~85%RH | |
| Humidity range | -40℃~+85℃ | -40℃~+85℃ | |
| External dimensions (mm) | 55.2×39.6×57.8 | 55.2×39.6×57.8 | |
| Product model | STE3-150 | STE3-200 | STE3-250 | |
| Contact form | 1H | 1H | 1H | |
| Auxiliary contact | NO | NO | NO | |
| Contact polarity | Having polarity | Having polarity | Having polarity | |
| Contact resistance | ≤1.5mΩ(at 150A) | ≤1.5mΩ(at 200A) | ≤1.5mΩ(at 250A) | |
| Operating voltage | ≤75%Un | ≤75%Un | ≤75%Un | |
| Maximum breaking current | 150A | 200A | 250A | |
| Electrical endurance | 10~1000V | 10~1000V | 10~1000V | |
| Maximum breaking current | 1600A(300VDC) | 2000A(300VDC) | 2000A(300VDC) | |
| Electrical endurance | 50 times(1000V,150A) | 30 times(1000V,200A) | 15 times(1000V,250A) | |
| Current carrying | 150A:Continuous for 400A:10min 800A:10s |
200A:Continuous for 400A:10min 800A:10s |
250A:Continuous for 400A:10min 800A:10s |
|
| Dielectric withstand voltage | Between open contacts | 4000VAC | 4000VAC | 4000VAC |
| Between contact coils | 4000VAC | 4000VAC | 4000VAC | |
| Mechanical Endurance | 2×10⁵ times | 2×10⁵ times | 2×10⁵ times | |
| Coil Voltage | 12V,24V | 12V,24V | 12V,24V | |
| Coil power consumption | Start 45W, maintain 2.8W | Start 45W, maintain 2.8W | Start 45W, maintain 2.8W | |
| Load extraction method | External thread | External thread | External thread | |
| Coil lead out method | lead wire | lead wire | lead wire | |
| Weight | 440g | 440g | 440g | |
| Vibrate | 10Hz~500Hz 49m/s² | 10Hz~500Hz 49m/s² | 10Hz~500Hz 49m/s² | |
| Humidity | 5%~85%RH | 5%~85%RH | 5%~85%RH | |
| Humidity range | -40℃~85℃ | -40℃~85℃ | -40℃~85℃ | |
| External dimensions (mm) | 80.3×66×64.3 | 80.3×66×64.3 | 80.3×66×64.3 | |
Note:
1.The above parameters are all initial values,measured at room temperature of 23℃.
2.Unless otherwise specified,the electrical durability tests are conducted on resistive loads with a on/off ratio of 0.6s:5.4s.
| Product model | STE3-300 | STE3-350 | |
| Contact form | 1H | 1H | |
| Auxiliary contact | NO | NO | |
| Contact polarity | Having polarity | Having polarity | |
| Contact resistance | ≤1.5mΩ(at 300A) | ≤1.5mΩ(at 350A) | |
| Operating voltage | ≤75%Un | ≤75%Un | |
| Maximum breaking current | 300A | 350A | |
| Electrical endurance | 10~1000V | 10~1000V | |
| Maximum breaking current | 2000A(300VDC) | 2000A(300VDC) | |
| Electrical endurance | 300A:Continuous for 400A:10min 600A:30s |
350A:Continuous for 400A:10min 800A:10s |
|
| Current carrying | 10 times(1000V,300A) | 50 times(1000V,300A) | |
| Dielectric withstand voltage | Between open contacts | 3300VAC | 3300VAC |
| Between contact coils | 3300VAC | 3300VAC | |
| Mechanical Endurance | 2×10⁵ times | 2×10⁵ times | |
| Coil Voltage | 12V,24V | 12V,24V | |
| Coil power consumption | Start 45W, maintain 2.8W | Start 45W, maintain 2.8W | |
| Load extraction method | External thread | External thread | |
| Coil lead out method | lead wire | lead wire | |
| Weight | 440g | 440g | |
| Vibrate | 10Hz~500Hz 49m/s² | 10Hz~500Hz 49m/s² | |
| Humidity | 5%~85%RH | 5%~85%RH | |
| Humidity range | -40℃~85℃ | -40℃~85℃ | |
| External dimensions (mm) | 80.3×66×64.3 | 80.3×66×64.3 | |
Note:
1.The above parameters are all initial values,measured at room temperature of 23℃.
2.Unless otherwise specified,the electrical durability tests are conducted on resistive loads witha on/off ratio of 0.6s:5.4s.
When the contactor is used in the charging circuit,a pre-charging circuit should be added to keep the impulse current below the rated make current.
As shown in the figure,first close the main negative contactor,then close the pre-charging contactor,and finally close the main positive contactor.If there is no pre-charging circuit,transient high current will be generated at the moment of the main contactor closing,which may cause the main positive contactor to stick.Please be careful.
The rated values in the contact parameters are all values for resistive loads.When using an inductive load (L load)with L/R>1ms,please install surge absorbing elements in parallel at both ends of the inductive load.Without taking measures,it may cause a decrease in electrical lifespan and result in poor continuity.
The on/off reliability of the product may change under small loads due to environmental conditions and on/off frequency,so it needs to be confirmed under actual loads.
This contactor is a DC high-voltage opening and closing device.In the final fault state,there may be a situation where it cannot be turned on or off.
Therefore,please do not use it beyond the capacity and frequency range specified in this manual.If it has reached the point where it cannot be connected or disconnected,it may lead to burning.A circuit structure that can cut off the current load in emergency situations should be adopted.To ensure safety,components should be replaced regularly.
For products that do not use coil drive boards or energy-saving versions,it is recommended to install nonlinear resistors (variable resistors are recommended)to suppress the reverse electromotive force of contactor coils.If diodes are used,the release time of the contactor will be greatly prolonged,which may lead to a decrease in cutting performance.Please be careful.
When conducting action voltage tests on products that use coil drive boards and energy-saving versions,the voltage should not slowly rise.Please use a fast rising edge(step power supply method)to drive the coil of the product,otherwise the contactor will not operate.At the same time,this type of product will automatically switch coil current after about 0.3 seconds of connection,and repeated on/off operations within 0.3 seconds will cause contactor failure.Please be aware.
It is strictly prohibited to place the contactor in an environment that exceeds the product temperature range(-40℃~+85℃) for a long time.
Please avoid installing near strong magnetic fields (transformers,magnets)and heating objects.
Ensure that the main power cord is closest to the outlet of the contactor.Then install and tighten in the order of flat washers,spring washers,and nuts.Incorrect connection sequence may cause severe overheating and lead to melting of the insulation layer of the connecting cable.
Please control the tightening torque of screws in each part within the specified range below.Beyond the range,it may cause damage to the ceramic sealing chamber and thread damage.In addition,the installation direction is not restricted.
| Load outlet end | Product shell installation part |
| M4 screws:2Nm ~ 3Nm | M4 screws:2Nm ~ 3Nm |
| M5 screws:3Nm ~ 4Nm | M5 screws:3Nm ~ 4Nm |
| M6 screws:6Nm ~ 8Nm | M6 screws:6Nm ~ 8Nm |
| M8 screws:8Nm ~ 10Nm |
Please avoid sticking foreign objects such as grease on the lead-out end;Please use the following specifications of connecting wires,otherwise it may cause abnormal heating of the lead-out section
| Current/A | Nominal cross-sectional area of conductor/mm² |
| 10 | ≥1.5 |
| 20 | ≥4 |
| 30 | ≥6 |
| 40 | ≥10 |
| 50 | ≥16 |
| 60 | ≥16 |
| 100 | ≥35 |
| 150 | ≥70 |
| 200 | ≥95 |
| 250 | ≥150 |
| 300 | ≥185 |
| 350 | ≥240 |
| 400 | ≥300 |
| 500 | ≥370 |
| 600 | ≥480 |
| 800 | ≥600 |
The suction voltage and release voltage will change with the ambient temperature and usage conditions,so please pay attention!
If the coil and contacts are continuously energized using the rated voltage (current)and then cut off,and immediately re-energized,this contactor will experience an increase in coil resistance due to the temperature rise of the coil,resulting in an increase in the suction voltage and exceeding the rated suction voltage.At this time,please take the following measures to reduce the load current,limit the power on time,and apply a coil voltage that exceeds the rated voltage of the coil (quick start).
When opening and closing without load,the contact resistance may increase,so please be careful!
This product contains resin,so please do not use it in places or environments where gasoline,diluents,alcohol lamps,organic solvents,and strong alkaline substances such as ammonia and sodium hydroxide may be attached.
Please be careful not to attach grease or foreign objects to the board terminals,otherwise it may cause abnormal heating of the load terminals.
Why Choose CHAC
With 30+ years of manufacturing experience, 1100+ employees, 100M+ poles
annual capacity and 90% automated production, CHAC provides stable production capacity and strict
quality control for global OEM/ODM customers. Our in-house manufacturing system supports long-term
cooperation for electrical brands, importers and distributors.
30+
YEARS EXPERIENCE
Specialized in low-voltage electrical manufacturing
1100+
EMPLOYEES
Professional team ensures stable quality and delivery
100M+
POLES ANNUAL CAPACITY
Large-scale production capacity to meet global demand
90%
AUTOMATED PRODUCTION
Advanced automation for high efficiency and consistency
Automated Assembly Line
Testing Laboratory
Injection & Stamping
Quality Inspection
Strict quality control system ensures every product meets global standards.
What Can We Customize?
CHAC supports customization of coil voltage, auxiliary contact configuration,
electrical parameters, product branding,packaging design and engineering development according to customers’ equipment and market requirements.
Coil Voltage
AC and DC coil voltage options tailored to application requirements.
Auxiliary Contacts
Flexible auxiliary contact combinations for different control functions.
Electrical Parameters
Current ratings, protection ranges and functional parameters can be customized.
Product Branding
Private label logos, nameplates and product identification support.
Packaging Design
Custom cartons, labels, manuals and packaging solutions.
Engineering Development
Support from drawing optimization to product development and application matching.
Download
STE Series High Voltage DC Contactor
Complete product overview for low-voltage electrical components and product selection reference.
Need Technical Documents?
Contact us for datasheets, certificates, drawings, selection guidance or OEM/ODM project support.
Frequently Asked Questions
Q1. Do you support product customization based on our design requirements?
A1:Absolutely. We specialize in OEM and ODM cooperation in the low-voltage electrical field and have provided customized services for many internationally renowned companies. We offer full-process support, including R&D design, parameter adjustments, and special material selection, ensuring the product fully meets your requirements.
Q2: What is your production capacity and Minimum Order Quantity (MOQ)?
A2: We operate a highly automated production base with an annual output of over 100 million poles for miniature circuit breakers. Our MOQ policy is flexible. We can provide competitive trial orders for small batches and dedicated production capacity guarantee plans.
Q3: What assurances are there for product quality and certifications?
A3: Our main products are certified with CCC, CE, CB, and more, and are sold in over 30 countries and regions worldwide. The company has established a dedicated Quality Operations Center that works with the business and production departments to implement full-process quality control, ensuring products meet international standards.
Q4: Do you have the capability for product R&D and turning concepts into reality?
A4: We have a complete R&D team and digital workshops, backed by extensive customization experience serving numerous international clients. From concept proposal and sample development to mass production, we provide end-to-end technical support to help bring your ideas to life.
