New Direct Replacement retrofitting kit for Megamax F1 and F2 

Open Door version with New Emax circuit breakers are available at ABB.

ABB can deliver new Direct Replacement retrofitting kits for Megamax F1 and F2 type, 3pole and 4pole, Open Door (up to 690Vac) withdrawable version, that have been designed to minimize both the out of service and the installation time. 

Thanks to the new ABB kits there is no need to dismantle the existing Megamax air circuit breaker fixed part.
Customers should only check its integrity and service conditions (auxiliary contacts wear conditions, cleaning, etc.).

The ABB kit consists in a dedicated New Emax moving part that immediately replaces the Megamax moving part.

The special moving part consists in:

  • A new draw-out mechanism that is able to replicate the Megamax in/ out positions by using the same Megamax drawing in/out lever. Even the IN/OUT Megamax pushbutton is replicated on the New Emax moving part.
  • Megamax standard male sliding contacts to connect with female part on Megamax fixed part: all the wirings are all already included so that customer can easily change the moving part of Megamax with the special moving part of New Emax
  • The new breaker is provided with activating levers for the Megamax standard O/C AUX contacts installed on the fixed part.

Adapting metal sheets for the new door flange for the compartment door as well as user friendly instructions are included.

The special New Emax moving part is equipped with the following default configuration: 

  • Special New Emax moving part
  • Standard Megamax sliding contacts (left and right) and wiring
  • Draw out lever
  • Door flange
  • Dedicated Coils support
  • Mechanical signalling of circuit breaker tripped
  • Anti-insertion locks
  • Lifting golfare
  • Electrical and Mechanical accessories mounted on Megamax air circuit breakers that can be replaced with the corresponding one of Emax

Electrical and Mechanical accessories mounted on Megamax that can be replaced with the corresponding ones of Emax:

YC (shunt closingrelease) Emax standard YC
YU (undervoltage release) Emax standard YU
D (electronical Delay for YU - into the switchboard) Remove the Megamax version and add the one of Emax standard
M (motor for charging spings)
Emax standard Spring charge motor
AUX Spring charged (S33M) Emax standard
AUX CB tripped - S51 Emax standard changeover contacts
AUX CB connected/ insulated position - S75S-S75I Already included in the sliding contacts (standard supply)
AUX YU (YU energized)
Emax standard
Electric TU reset
Not available
PR1/A (Ammeter module)
Only with PR122/3
PR1/C (Control module)
No more available
PR1/D (Insum dialog module)
No more available
Q1…Q25 (Open/Close AUX contacts)
Use same of Megamax on Fixed Part
SD devices
No more available
TV 051 (voltage transformer)
No more available. Use internal PR120/V module
Megamax Shutter padlock device
Use the one of Megamax
Current sensor for neutral conductor outside circuit-breaker (into the switchboard)
Remove the Megamax version and add the one of Emax standard
Key lock in open position
Emax standard
Padlock in open position
Emax standard
Mechanical operation counter
Emax standard
IP54 door protection
Emax standard
Transparent protective cover for O/C pushbuttons
Emax standard
SOR Test Unit
Emax standard

Good to remember that the following Emax accessories are not compatible with Emax Direct Replacement kit: 

  • Internal and external O/C AUX
  • Remote reset command for tripped indication
  • ATS
  • Homopolar toroid
  • Lock in/test/out position
  • Mechanical lock for compartment door
  • Mechanical interlock
  • Emax Lift Device
  • All accessories for Emax fixed part
  • PR120/K
  • PR120D-M
  • EP010
  • HMI030

ABB recommends the use of the dedicated configurator tool in order to find out the correct ordering codes, that fulfil all requirements in accordance with the Megamax circuit breaker installed.

See the link (link)

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