Proterra Catalyst BE40

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Proterra Catalyst BE40
Proterra 2014 Catalyst demonstrator-a.jpg
Years of manufacture 2014 to present
Length 42 feet
Width 102 inches
Power/Fuel Electricity

The Proterra Catalyst is the company's second generation battery electric low floor transit bus. It was first launched as the 40-foot Catalyst BE40 at the 2014 APTA Bus and Paratransit Conference in Kansas City. Foothill Transit, the launch customer for the first generation bus, was the first to order the latest generation bus.

The bus can travel up to 55 miles before the standard fast charge (FC) batteries, now lithium–titanate instead of lithium-ion, need to be recharged. In February 2015, Proterra introduced an extended range (XR) option that allows the bus to travel up to 180 miles between charges. A year later, Proterra introduced an enhanced XR battery that holds 28 percent more energy at 330 kWh, allowing the bus to travel up to 193 miles. At the 2016 American Public Transit Association (APTA) Annual Meeting, Proterra unveiled their E2 (Efficient Energy) battery option with a capacity of 440 to 660 kWh that allows the bus to travel between 194 and 350 miles. This range is able to meet a full day's worth of service for some agencies.[1]

At the 2017 American Public Transit Association EXPO in Atlanta, Proterra introduced their DuoPower drivetrain. It integrates two 190 kWh electric motors and two-speed transmission into a planetary axle from AxleTech. It boasts almost twice the horsepower as the standard ProDrive drivetrain and is five times more efficient than a standard diesel bus. With the DuoPower drivetrain, the Catalyst E2 max has a nominal range of 426 miles.[2]

The bus's batteries can be charged enroute with a proprietary overhead charging station, which features automatic docking.[3] The standard FC option can be fully charged in ten minutes, while the XR option can be fully charged in approximately one hour.[4] The bus can also be plugged in using a J1772 CCS charger at the garage. The E2 is only charged this way while the bus is out of service, typically when it is parked overnight, at the garage and is fully charged in three to five hours.


Length: 42' 6"
Width: 102"
Height: 135.5"
Wheelbase: 24’ 8"
Turning Radius: 41.9'
GVWR: 43,650 lbs
Traction motor Availability
ProDrive drivetrain UQM HD220 220 kW peak permanent magnet motor 2014 to present
DuoPower drivetrain Dual independent 190 kW motors 2017 to present
Eaton EEV-7202 2-speed auto-shift EV transmission
Independent front suspension and multi-link air-ride rear suspension
Four wheel disc brakes w/ ABS and optional traction control
Battery options
Series Model Nominal range Standard charge time Curb weight
ProDrive FC (Fast Charge) FC 55 miles <1 hour 28,324 lbs
FC+ 72 miles <1 hour 29,900 lbs
DuoPower FC (Fast Charge) FC 49 miles <1 hour 26,446 lbs
FC+ 62 miles <1 hour 29,900 lbs
ProDrive XR (eXtended Range) XR 136 miles <2.5 hours 26,750 lbs
XR+ 193 miles <2.5 hours 28,324 lbs
DuoPower XR (eXtended Range) XR 164 miles <2.5 hours 26,750 lbs
XR+ 238 miles <2.5 hours 28,324 lbs
ProDrive E2 (Efficient Energy) E2 251 miles <3 hours 29,900 lbs
E2+ 303 miles <3.5 hours 31,574 lbs
E2 max 350 miles <4.5 hours 33,150 lbs
DuoPower E2 (Efficient Energy) E2 305 miles <3 hours 29,900 lbs
E2+ 367 miles <3.5 hours 31,574 lbs
E2 max 426 miles <4.5 hours 33,150 lbs


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  1. Proterra Catalyst® E2 Series Sets New Industry Precedent with a Nominal Range of up to 350 Miles. Press release. 12 September 2016. Protera, Inc. Retrieved on 16 November 2016.
  2. Proterra Introduces the DuoPower™ Drivetrain for its Catalyst® Zero-Emission Buses at APTA. Press release. 09 October 2017. Proterra.
  3. Proterra, bus maker, aims to follow Tesla model. Retrieved on 02 September 2014.
  4. Proterra Introduces Extended-Range Electric Bus, Flexible Battery System. Press release. 24 February 2016. Protera, Inc. Retrieved on 16 November 2016.