Rockwill Electric Group
Rockwill Standard Recloser
Rockwill Auto Recloser is a IEC standard intelligent pole mounted switch for using on medium voltage overhead distribution lines. It is also called vacuum recloser, pole mounted recloser or outdoor recloser. ...

Detailed description

  • Description
  • Specification of Auto recloser
  • Functions of auto recloser
  • Feature of auto recloser
  • Mobile APP of auto recloser
  • How to quick operate auto recloser

What is the standard of Rockwill Auto Recloser?

Rockwill Auto Recloser is a flexible pole mounted outdoor vacuum switching device that can trip and reclose up for a temporary distribution line fault. It reduces the blackout time greatly and improves the stability of power grid operation. The operation status also can be controlled and monitored by mobile phone and SCADA system.

Rockwill standard auto recloser is fully meets the IEC62271-111 & ANSI/IEEE C37.60 standard. Fully follow the above standard for type test and routine test. Additional functions reuirement is offered, like: ESKOM standard, TANESCO standard, BPC standard, SEC standard, DEC, Meralco, KPLC, BREB, etc. Besides, Rockwill even provide with patent design for new recloser.

RCW+ Auto Recloser

RCW+ type auto recloser is ANSI/IEC standardized plus design products which is equipped with one magnetic actuator mechanism, one manual closing/opening/Locking device, 3 current sensors, max 6 voltage sensors, with more functional like protection curves + curves programble, coodination logics + logics  programble, programble communication protocols (Modbus, DNP3.0, IEC 60870-5-101/104), PC software, APP control tool, etc.

RCW+ type automatic circuit recloser is a solid insulation reclosure with zero pressure SF6 gas sealed. It has higher creepage design and higher insulation level for using on Maximum 42kV level sytem. 

It uses vacuum interrupting technology, and meeting IP67 IP protection class, It avoids any bad influence like high polution enviroment of humidity, salt or alkali incursion or small animals.

● Main technical data of auto recloser

N Item Unit Data
1 Rated max voltage kV 12 15 27 38
2 Rated current A 630/800/1250
3 Rated frequency HZ 50/60
4 Power frequency 1min Dry kV 45 55 65 95
Wet 30 45 55 80
5 Lightning impulse withstand voltage(peak) kV 75/95* 95/100* 125/150* 170/200*
6 Rated short circuit breaking current kA 12.5/16/20/25*
7 Rated short current switching current(peak) kA 31.5/40/50/63*
8 Rated peak value withstand current kA 31.5/40/50/63*
9 4S short time withstand current kA 12.5/16/20/25*
11 Rated operating circulate   O-0.5S-CO-2S-CO-2S-CO
10 Breaking current frequency under rated short circuit time 200
12 Mechanism life time 10000
13 Secondary loop 1 min power frequency withstand kV 2
14 Auxiliary voltage supply Vac 220±20%
15 Battery bank Vdc 12×2
16 Capacitor unit Vdc 220
Rockwill's recloser gather multi relay protections like:
EF1/EF2 SEF1/SEF2 Cold Load Pickup
Live Load Blocking Oscillography Capture capability
Programmable Logic 4 Independent Protection Groups
Advanced Automation Harmonic Protection and Monitoring
Hot Line Tag Capability Negative Phase Sequence Overcurrent
Inverse Time Protection Live Line Function & Hot Line Tag Function
Definite Time Protection Directional Sensitive ground Fault Protection
Two fast-two slow curves Phase (OV1) & Line-to-Line (OV2) Over Voltage
Temporary Time Addition Directional over current and ground fault protection
Voltage Protection Element Phase under-voltage balanced element (UV1)
Logic program-able function Phase-to-Phase Under-voltage Element (UV2)
Zone Sequence Co-ordination Loss of Supply (UV3)
High set Instantaneous element Voltage Sag Protection (UV4 Sag)
Power Quality monitoring including Systems Performance Indices, Voltage Sags and Swells
Voltage reclose control with automatic back feed(restoration provides loop automation functionality)

If you want more functions, pls consult with us!

Part Number RCW15M/630-20 RCW27M/630-20 RCW38M/630-20
Current Sensing 3 x Current Transformers 3 x Current Transformers 3 x Current Transformers
Voltage Sensing 3 x Voltage Sensors 3 x Voltage Sensors 3 x Voltage Sensors
Control Type RWK-351 RWK-351 RWK-351

● Service environment

Air temperature: Maximum temperature: +85℃; Minimum temperature:-45℃

Humidity: Monthly average humidity 95%; Daily average humidity 90% .

Altitude above sea level: Maximum installation altitude: 2500m or more higher.

Ambient air not apparently polluted by corrosive and flammable gas, vapor etc. No frequent violent shake

●Offering With optional classes for rated current range:

--Type RCW12, Rating 6-12 kV with 630A, 16 kA up to 1250A, 20kA;

--Type RCW15, Rating15-20 kV with 630A, 16 kA up to 1250A, 20kA;

--Type RCW27, Rating22-27 kV with 630A, 16 kA up to 1250A, 20kA;

--Type RCW38, Rating30-40.5 kV with 630A, 16 kA up to 800A, 20kA;

With optional classes for different grid application installation: Single phase & Three phase.

With optional relay protection& logics for user choice:

+Instantaneous over-current protection.

+Timing over-current protection

+Negative sequence over-current protection.

+Directional over-current protection(*).

+Over-voltage protection./Under voltage protection.

+Programable protection relay curves total 10 nos ANSI/IEC curves.

+Cold load pickup protection TCC +Hot line tag

+Earth protection EF/SEF +Zone Sequence Co-ordination

+More relay functions can be customized.

With optional communication protocols & I/O port for user choice:

advanced auto recloser controller

RS-232 and RS-485 ports supporting.

DNP3.0 communication protocol support(*).

Modbus communication protocol is optional(*).

IEC 60870-5-101 communication protocol support.

IEC 60870-5-104 communication protocol support.(*).

IEC 61850 communication protocol support.(*).

The recloser can communicate through GPRS(Or GSM) modem with English or Specified language (*).

With optional functions for user.

Rated currents, System phase current.

Rated voltages, System phase voltage& secondary low voltage power supply voltage. Frequency, power(kWh),

reactive power(kV arh), power factor .

With optional reclosing interval for user pre-program:

Reclosing times setting support.

Dead time setting support.

With events recording function:

SOE 10000 operations record.

Fault record and normal operation record.

Note: (*) mean should customized by manufacturer if needed.

●Time-Overcurrent Curves The following information describes the curve timing for the curve and time dial settings made for the time-overcurrent

elements The time-overcurrent relay curves in conform to IEEE C37.112-1996 IEEE Standard Inverse-Time

Characteristic Equations for Overcurrent Relays.

IEC Curves:  
auto recloser protection IEC curve C1 (Standard Inverse)
C2 (Very Inverse)
C3 (Extremely Inverse)
C4 (Long-Time Inverse)
C5 (Short-Time Inverse)
U.S. Curves:  
auto recloser protection ANSI curve U1 (Moderately Inverse)
U2 (Inverse)
U3 (Very Inverse)
U4 (Extremely Inverse)
U5 (Short-Time Inverse)

● PC software for controller Testing, Setting, programing, Update.

auto recloser parameter setting software

Human friendship interface                                               Programmable Time-Overcurrent curve

auto recloser PC testing software


● Recloser feature a)Outline of recloser:

The RCW series vacuum recloser is mainly combined with integration terminal, current transformer, permanent magnetic actuator and it’s recloser controller.

b)The recloser tank feature:

The Vacuum recloser tanks are manufactured from 304# grade stainless steel and are powder coated a light grey colour. Whole recloser IP67 protection class, equipped with a auxiliary plug to connect with recloser controller by control cable, Diameter Max22mm, 6 M length (8M for special).

It’s can performance serve more than 20 years long term under heavy duty circumstance.

● Main new advantages of RCW

auto recloser switch tank


Visible ON/OFF indicatorIP67 class waterproof plug connector

1.Apply ANSOFT design the high performance magnetic actuator,high reliable and free maintenance
2.Manual closing device
3.Automatic Blocking Device for Manual opening
4.Mechanical locking device
5.Electronic locking device
6.Mechanical counter
7.Electronic counter
8.Visble on the ground reflector material mechanical open/closer indicator
9.IP67 inflatable tank SF6 Gas insulation,Pneumatic value,barometer
10.Integral type tank .Lifting lug, Earthing bolt
Note:The above parts are optional devices.Please provide requirement before placing an orde


Primacy incomer terminal (directly connect to interrupter reduce power lost) Current sensor (external modular design easy for quality control and maintenance) Accuracy: ±0.5% Ratio:800/1

solid dielectric auto recloser vacuum pole

Vacuum interrupter(Adopt the APG technology,increasing the whole insulation and weathering performance)
Internal Voltage sensors incorporated within the vacuum interrupter module It's equipped with two voltage sensors,one for measuring the voltage of incoming side,and another one for measuring the voltage of outgoing side.

solid dielectric auto recloser pole

shielded 4-conductor cable connection  Accuracy:±0.2% Voltage Sensor  Ratio:500/1 or 1000/1


● Creepage Distances of RCW

Description 12kV BIL
15kV BIL
38kV BIL
Terminal to terminal creepage 600mm 840mm 1250mm 1380mm
Terminal to ground creepage 510mm 760mm 1200mm 1300mm

●Accessories of RCW

All above insulating components for BIL 200kV expanding using. Any question please contact with our engineer.

Upper voltage shield 3 pcs/set

Standard made of T2 copper material, for 630/1250A rated current using. With  expanding range.

Terminal 6 pcs/set

Map guide&location Monitoring&Controlling

auto recloser mobile software auto recloser APP management software


Setting & Modification Event Records



●Master software for Distribution Automation Management

The Sternest Warning Before You Operate Recloser!


Make Sure That:

1. Please make sure the battery is ready full charged (12 hours) before operating recloser controller!

2. It is not allowed to use emergency opening and closing handle at normal condition!

3. It is not allowed to repeat press the Open/Close button continuously without intermission!


Further Warning!

Special attention should be paid to the following points, which may cause the recloser to fail to work.

  1. About Controller parameter setting

▲Do not modify CT rate, PT rate, PTS rate in controller!

▲Do not modify recloser sequence, it is O-0.5s-CO-2s-CO-5s-CO in IEC standard.   

auto recloser CT rate setting auto recloser PT rate setting auto recloser parameter modification


  1. About OPEN/CLOSE operation

 ▲It’s not allow to repeat press the Open/Close button continuously without intermission.

 ▲Please contact us in time, frequent operation will burn the controller components

auto recloser controller operation


  1. About manual closing device (Yellow handle)

 ▲It is not allowed to do manual closing operation if not necessary emergency demand.

 ▲Make sure the recloser is at OFF position and controller can’t drive it into close situation

 ▲After closing successfully, continue to pull down for 3 times to release the lockout.

 ▲It is only allowed to be used in special non-electric operation situation.


The above three points are special remarks, do observe strictly.


Please do not hesitate to contact me if any queries.

Field service operation and warranty issues:

ROCKWILL® can provide competent, well trained field service representatives to provide technical guidance and advisory assistance for the installation, overhaul, repair and maintenance of ROCKWILL® equipment, processes and systems.

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