21 Mount Hole Small Breaker [35mm]
- Model: P2P21T110
- 110℃
- 120℃
- 130℃
- There are straight handles and curved handles.
57.4mm mounting hole submersible single phase circuit breaker used for 5-100KVA single phase oil type transformer at 120/240 volts
Low loss, High interrupting capabllity
Resetting Mechanlsm&Emergency Control, Easy for Malntalnance
Complete Certification
Specifications
| Model | P2P21T110 |
| Rated Current | 21A |
| For Transformer | 5KVA/10KVA |
| Rated Voltage | 240V/480V |
| Trip Temp. | 110℃, 120℃, 130℃ |
| Phase | 1F |
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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)
🔴Our products come in two styles: straight handle and curved handle. 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 onthe 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 P2P21TXXX 21 5 240 Yes Yes No 3800 2.1 10 480 P2P42TXXX 42 10 240 Yes Yes No 3200 7 P2P63TXXX 63 15 240 Yes Yes No 2100 10 P2P105TXXX 105 25 240 Yes Yes No 900 12 50 480 P2P157TXXX 157 37.5 240 Yes Yes Yes 800 24 75 480 P2P210TXXX 210 50 240 Yes Yes Yes 750 41 100 480 Note:
- 3P42TXX,"3P" means 3 poles,"42" means current,"TXXX" means trip temperature, for example "T120" means thetrip temperature is 120'℃c , 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) P2P42TXXX 42 4 P2P63TXXX 63 4 P2P105TXXX 105 7 P2P157TXXX 157 11 P2P210TXXX 210 11 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 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].
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Video & Photos
Installation Video
Installation video of the curved handleStraight handle installation videoApplication
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FAQS
Q1:How Does a CSP Circuit Breaker Work?
A1:Over current Protection Function: When the current exceeds the rated capacity, the thermal-magnetic trip mechanism detects overloads or short circuits.It automatically disconnects the circuit, preventing conductor overheating or equipment failure.
Q2:What are the advantages of oil-immersed circuit breakers compared to vacuum types?
A2: Oil-immersed circuit breakers provide better cooling, insulation, and resistance to outdoor environments, making them ideal for remote or harsh locations. Vacuum types are preferred for indoor or high-frequency switching applications.
Q3: What is the maintenance cycle for an oil-immersed CSP breaker?
A3:Routine oil sampling and mechanical inspection are recommended every 3–5 years; under normal operation, maintenance requirements are minimal.
Q4: What is the typical lead time for orders?
A4: Standard models are available in stock; customized orders usually require 3–4 weeks.
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