Home / Product / 57.4mm Mount Hole Circuit Breaker / Single phase 1F circuit breaker / 105 Single Phase 1F Circuit Breaker [57.4mm]

105 Single Phase 1F Circuit Breaker [57.4mm]

Model: 2P105T110: 110℃; 120℃; 130℃

57.4mm Mounting Hole Single Phase Circuit Breakers, Used For Single Phase Oil Immersed Distribution Transformers.CSP Circuit breaker Is Installed On The Secondary Winding Of the Transformer, is Used For Over Load Protection And Short circuit Protection.

Request Quote

Low loss, High interrupting capabllity

Resetting Mechanlsm&Emergency Control, Easy for Malntalnance

Complete Certification

Specifications

Model	2P105T110
Rated Current	105A
For Transformer	25KVA/50KVA
Rated Voltage	240V/480V
Trip Temp.	110℃, 120℃, 130℃
Phase	1F
Mounting Hole Diameter	57.4mm

Standards Product Dimension Video & Photos FAQS

Standards

❖ Standards for Reference:

ANSI C 57.109-2018 (Revision of lEEE Std c57.109-1993) lEEE Guide for liguid-immersed Transformer.
Through-Fault-Current Duration.
lEEE Standard C37.91 -2008, lEEE Guide for Protecting Power Transformers.
lEEE Standard C57.91-2011/IEEE C57.12.00-2015 /EEE C57.12.90-2015.
IEEE C37.13-2015 /EEE C37.50-2018.
IEC60947-2:2016+AMD1:2019 Part 2:Circuit-breakers.
PLN D30.002-2008(Indonesia)Specification for CSP transformers.

❶ Specification and Data Sheet

It is single phase circuit breakers, used for single phase transformers. Circuit breaker is installed on the secondary winding of the transformer, is 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
2P21TXXX	21	5	240	Yes	Yes	No	3800	2.1
2P21TXXX	21	10	480	Yes	Yes	No	3800	2.1
2P42TXXX	42	10	240	Yes	Yes	No	3200	2.1
2P63TXXX	63	15	240	Yes	Yes	No	2100	10
2P105TXXX	105	25	240	Yes	Yes	No	900	12
2P105TXXX	105	50	480	Yes	Yes	No	900	12
2P157TXXX	157	37.5	240	Yes	Yes	Yes	800	24
2P157TXXX	157	75	280	Yes	Yes	Yes	800	24
2P210TXXX	210	50	240	Yes	Yes	Yes	750	41
2P210TXXX	210	100	280	Yes	Yes	Yes	750	41
2P313TXXX	313	75	240	Yes	Yes	Yes	500	60
2P313TXXX	313	150	480	Yes	Yes	Yes	500	60
2P420TXXX	420	100	240	Yes	Yes	Yes	450	98
2P420TXXX	420	200	480	Yes	Yes	Yes	450	98

Note:

2P42TXX → “2P” means 2 poles, “42” means current, “TXXX” means trip temperature.
Example: “T120” means the trip temperature is 120°C.
Temperature can be set from 90 to 130 degree, with ±10% tolerance.
There are ±10% tolerance for resistance and losses, emergency tolerance: ±10%.

❷ Electrical specification for all CSP Oil Type Circuit Breaker

Max Voltage	Power Frequency Test (one minute) 50/60HZ	Lightening Impulse Test	Insulation Resistance (5000V)	Normal Interrupting Capacity
600V	≥10KV	30KV	≥5000MΩ	11KA~20KA

❸ Interrupting Capacity

Model	Current (A)	Interrupting Capacity(KA)
2P42TXXX	42	11
2P42TXXX	42	11
2P63TXXX	63	11
2P105TXXX	105	11
2P157TXXX	157	11
2P157TXXX	157	11
2P210TXXX	210	11
2P210TXXX	210	11
2P313TXXX	313	20
2P420TXXX	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.
Video & Photos

Installation Video

Application
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: How To Install Csp Circuit Breaker On The Tank Wall Of Transformer?

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: Do You Provide Oem/Odm Services?

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.