420 ThaiStyle 3F Circuit Breaker [57.4mm]
- Model: 3P420T120
- 110℃
- 120℃
- 130℃
- There are Thai styles
This Is a Three-Phase Circuit Breaker with a Mounting Hole Diameter of 57.4 Mm, Suitable for Three-Phase Oil-Immersed Distribution Transformers. The CSP Circuit Breaker Is Installed on the Secondary Winding of the Transformer for Overload and Short-Circuit Protection, And Is Available in Standard and Thai-Style Models.
Low loss, High interrupting capabllity
Resetting Mechanlsm&Emergency Control, Easy for Malntalnance
Complete Certification
Specifications
| Model | 3P420T120 |
| Rated Current | 420A |
| For Transformer | 300KVA/300KVA |
| Rated Voltage | 400V/420V |
| Trip Temp. | 110℃, 120℃, 130℃ |
| Phase | 3F |
| Mounting Hole Diameter | 57.4mm |
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Standards
❖ Standards for Reference:
- ANSI C 57.109-2018 (Revision of lEEE Std c57.109-1993) lEEE Guide for liquid-immersed Transformer through-Fault-Current Duration
- lEEE Standard C37.91 -2008, lEEE Guide for Protecting Power Transformers.
- IEEE Standard C57.91-2011/IEEE C57.12.00-2015 /IEEE C57.12.90-2015
- IEEE C37.13-2015 /IEEE C37.50-2018
- IEC60947-2:2016+AMD1:2019 Part 2: Circuit-breakers.
- PLN D30.002-2008(Indonesia)Specification for CSP transformers
- lEEE Standard C37.41 & C37.42 (HV Fuse)
🔴We also have a Thai version of this product with the handle on the right. Please contact us for more information.[📪nancywang@ketranele.com].
❶ Specification and Data Sheet
lt is three phase circuit breakers, used for three phase transformers. Circuit breaker are installed on the secondary winding of the transformer, are used for over load protection and short circuit protection.
Model Current (A) Rating (KVA) Voltage (V) Signal light Emergency switch (overload) Magnetic protection Resistance (Ω) at 25°C 2 poles Loss (W) at 85°C 2 poles 3P63TXXX 63 45 400 Yes Yes No 3150 15.2 50 420 3P105TXXX 105 75 400 Yes Yes No 1350 18 75 420 3P157TXXX 157 100 400 Yes Yes Yes 1200 36 112.5 420 3P210TXXX 210 150 400 Yes Yes Yes 1140 63 150 420 3P313TXXX 313 200 400 Yes Yes Yes 750 90 225 420 3P420TXXX 420 300 400 Yes Yes Yes 680 148 300 420 3P433TXXX 433 300 400 Yes Yes Yes 680 157 300 420 Note:
- 3P42TXX,"3P" means 3 poles,"42" means current,"TXXX" means trip temperature, for example "T120" means the trip temperature is 120℃ , Temperature can be setted from 90 to 130 degree, with +/-10% tolerance.
- And there are +10% tolerance for resistance and losses, emerency tolerance: +/-10%.
❷ Electrical specification for all CSP Oil Type Circuit Breaker
Max Voltage Power Frequency Test
(one minute) 50/60HZLightening Impulse Test Insulation Resistance (5000V) Normal Interrupting Capacity 600V ≥10KV 30KV ≥5000MΩ 11KA~20KA ❸ Interrupting Capacity
Model Current (A) Interrupting Capacity(KA) 3P42TXXX 42 4 3P63TXXX 63 4 3P105TXXX 105 7 3P157TXXX 157 11 3P210TXXX 210 11 3P313TXXX 313 20 3P420TXXX 420 20 ❹ Trip Temperature and Bi-metal Temperature Rise to Oil
(Trip temperature = Bi-metal trip temperature)
No. Bimetal ID Current (I: A) Bi-metal Ampere Response Factor (J: °C/A²) Bi-metal temperature rise to oil (ΔT: °C) Oil temperature (To: °C) Bi-metal temperature (T: °C) 01 21 21 0.0125000 5.5 To 5.5+To 02 42 42 0.0040000 7.1 To 7.1+To 03 63 63 0.0019904 7.9 To 7.9+To 04 105 105 0.0008114 9.5 To 9.5+To 05 157 157 0.0002000 4.9 To 4.9+To 06 210 210 0.0001120 4.9 To 4.9+To 07 313 313 0.0000610 6.0 To 6.0+To 08 420 420 0.0000720 12.5 To 12.5+To 09 433 433 0.0000720 13.5 To 13.5+To T:Bi-metal temperature(℃ )
ΔT:Bi-metal temperature rise to oil(℃ )
To:oil temperature(℃)
I:Current flow through the Bi-metal trip in(A)
J:Bi-metal Ampere Response Factor in (J:℃ /A²)
ΔT=I²*J
T= ΔT+To
Note: When Bi-metal temperature reaches the trip temperature setting of the breaker,the breaker trip. -
Product Dimension
Key Dimensions Overview
The following drawings show only partial product dimensions.
For the complete set of engineering drawings or full specifications, please contact us at [📪nancywang@ketranele.com].
Warm Tips Before Use
Thank you for using our CSp type circuit breakers, when you receive circuit breakers, please be informed with the following tips:
❶ If you need put the circuit breakers into dry oven for drying process, please make sure remove the lamp cover; lampbulb and lamp sealing ring before put into dry oven.
❷ After long-time drying process, it maybe make a few circuit breakers dificult to operate on opening and closing, youcan just put some transformer oil on the circuit breakers,it will work smoothly again.
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Video & Photos
Installation Video
Application
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FAQS
Q1: What is a three-phase CSP oil-immersed circuit breaker?
A1: Three-phase CSP oil-immersed circuit breaker is a high-voltage distribution device with Completely Self Protected (CSP) functionality. Widely used in pole-mounted three-phase transformers , pedestal-mounted or pad-mounted box-type three-phase transformers .
Q2: What is the difference between a three-phase CSP oil-immersed circuit breaker and a single-phase circuit breaker?
A2: The main difference lies in the number of phases and application scenarios. A three-phase circuit breaker can control all three phases simultaneously, suitable for industrial power systems and high-power equipment, while a single-phase breaker is mainly used for small-scale distribution or rural grid branches. Three-phase CSP breakers offer better synchronization and current balancing.
Q3: What application scenarios are CSP circuit breakers suitable for?
A3:CSP circuit breakers are widely used for distribution transformer protection, rural grid upgrades, industrial and mining power supply systems, and wind or solar power grid integration. Their high reliability and automatic protection features make them ideal for unmanned or complex environments.
Q4: Can the product be customized according to customer needs?
A4: Yes. Customization is available based on customer requirements for rated voltage, current, installation type, and control scheme, including OEM services.
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