This document provides specifications for a Type PM, 38-72.5 kV power circuit breaker with interrupting capability up to 40 kA. Key features include a dead tank design with one self-blast interrupter per tank, factory leak testing, ANSI certification, an FSA-2 motor charged spring operating mechanism, and continuous current ratings up to 3000 A. Options include condition monitoring, extra bushings, tank heaters, and seismic qualification. The breaker offers high performance, reliability, and services to reduce costs and speed installation.

1. Type PM, 38-72.5 kV, up to 40 kA
Power Circuit Breaker
Standard features
- Dead tank design, with one self-blast interrupter per tank on a
galvanized steel frame
- All tanks factory leak tested in a hard-vacuum chamber with a
helium mass spectrometer
- Certified per ANSI C37.04, C37.06, and C37.09 Standards
- FSA-2 motor charged spring operating mechanism
- Frame mounted NEMA-3R steel control cabinet protected with
TGIC polyester powdercoat finish
- Single tank-mounted gas density monitor and pressure gauge
- Porcelain bushings
- Continuous current ratings through 3000 A
- Ships fully assembled and factory tested with 5 psig SF6 gas
Options and accessories
- Condition monitoring with the Circuit Breaker Sentinel (CBS)
- Density monitor and temperature-compensated pressure gauge
directly-mounted on each tank
- Extra creep and/or extra strike bushings for special applications
- Silicone rubber composite bushings
- Tank heaters for operation in ambient temperatures below -40ºC
- High seismic designs
- National Board certification of interrupter tanks per the ASME
Pressure Vessel and Boiler Code
With a large installed base and proven track record, the PM FSA-2 mechanism
breaker offers unequalled performance and reliability. The type FSA-2 spring mechanism, mounted
within the breaker control cabinet, provides
ABB advantages the driving force to gang-operate the
- Interrupting performance up to 40 kA breaker’s self-blast interrupters. Mechanical
- High performance interrupters for definite purpose breaker reduce energy for closing is stored in a pair of helical
potential for overvoltages caused by restrikes during capacitor springs, whose charge is maintained by a
bank switching universal motor. Each closing operation
- One-piece interrupter assembly simplifies field change-out simultaneously charges a similar pair of trip
whenever end of life is reached by eliminating need for internal springs.
tank mounting of separate parts and alignment
- Simple, low powered motor-charged spring mechanism imparts The mechanism is simple and relatively low
minimal mechanical stress to the breaker, reducing maintenance powered, resulting in minimal mechanical
costs stresses during breaker operation and lower
- Externally accessible current transformers enable simple field overall maintenance costs.
change-out without degassing breaker and bushing removal
- Extensive range of available field services, from technical
assistance to turn-key installation, can dramatically reduce
construction costs and speed time to commercial operation
- Suitable for cold weather operation down to -40°C ambient
without tank heaters, saving acquisition as well as operating costs

2. 10 1/4"
(260)
96 25/32" (2459)
SHIPPING AND INSTALLED WIDTH 36 5/32"
33 11/16" (855) 33 11/16" (855) (918.4)
PHASE SPACING PHASE SPACING
66 27/35" (1698)
CLEARANCE TO REMOVE INTERRUPTER
27" (688) 27" (688) 21" (305) 29 1/2" (749)
METAL TO METAL METAL TO METAL ADDITIONAL HEIGHT REQUIRED METAL TO METAL
FOR BUSHING REMOVAL
19 5/16" (491)
MIN. METAL TO GRD.
101 7/16"
(2576)
SHIPPING HEIGHT
Document Number - 2GNM110001 / January 2009
MIN. RUPTURE
MONITOR DISC
POLE 1
128" ASME
(3251) STAMPING
LIVE ON TANK
AND END
70 5/8" PARTS
COVER
(4971)
HEIGHT OF 130 5/16" (AS REQUIRED)
COUNTER (3110)
POSITION INSTALLED
INDICATOR HEIGHT TO
AND TOP OF
SPRING BUSHING
POSITION
109" 145 1/2"
INDICATOR
(2770) LOCATION OF (3696)
MINIMUM EXTERNAL
33 5/8" BUSHING 93 1/16" ELECTRICAL
83 7/32" 31 7/8" (854) HEIGHT (2364) “69” SW.
(2114) (810) BOTTOM OF HEIGHT TO (AS REQUIRED)
HEIGHT OF LEG CONTROL BREAKER
C/L LOCATION OF
GAS GAUGE/ EXTENSIONS CABINET EXTERNAL ELECTRICAL
FILL VALVE OUTLET
(AS REQUIRED)
Rated capabilities
Short Circuit Maximum Power Frequency 2 µ-sec Chopped
Rated Maximum and Short Time Continuous Rated Interrupting Full Wave Insulation Wave Impulse Closing and
Circuit Breaker Voltage Current Current Time Withstand Voltage Withstand Voltage Voltage Latching Current
Type (kV, rms) (kA, rms) (A, rms) (Cycles) (kV, Peak) (kV, rms) (kV, Peak) (kA, Peak)
38PM31-12 38 31.5 1200 3 200 80 258 82
38PM31-20 38 31.5 2000 3 200 80 258 82
38PM31-30 38 31.5 3000 3 200 80 258 82
38PM40-12 38 40 1200 5 200 80 258 104
38PM40-20 38 40 2000 5 200 80 258 104
38PM40-30 38 40 3000 5 200 80 258 104
48PM31-12 48.3 31.5 1200 3 250 105 322 82
48PM31-20 48.3 31.5 2000 3 250 105 322 82
48PM31-30 48.3 31.5 3000 3 250 105 322 82
48PM40-12 48.3 40 1200 5 250 105 322 104
48PM40-20 48.3 40 2000 5 250 105 322 104
48PM40-30 48.3 40 3000 5 250 105 322 104
72PM31-12 72.5 31.5 1200 3 350 160 452 82
72PM31-20 72.5 31.5 2000 3 350 160 452 82
72PM31-30 72.5 31.5 3000 3 350 160 452 82
72PM40-12 72.5 40 1200 5 350 160 452 104
72PM40-20 72.5 40 2000 5 350 160 452 104
72PM40-30 72.5 40 3000 5 350 160 452 104
For more information please contact:
ABB Inc.
High Voltage Products
Westmoreland Distribution Park East
100 Distribution Circle
Mount Pleasant, Pennsylvania, USA
Phone: +1 (724) 696-1500
Fax: +1 (724) 696-1502
www.abb.com/highvoltage