PB72 High Voltage Dead Tank Circuit Breakers
Reliable High-Voltage Power Control
The PB72 Family of High-Voltage Dead-Tank Circuit Breakers (38.5–72.5kV) combines proven performance with easy maintenance and long-term reliability. With advanced insulation, efficient heating, and customizable options, they deliver dependable protection in even the toughest conditions.
Rated for 38.5–72.5kV high-voltage applications
Advanced spring and interrupter design for superior performance
Tested to 50kA short-time current with zero contact deformation
First-pole-to-clear factor of 1.5 at 170kV
Built-in lubrication fittings and tool-free maintenance access
Powder-coated NEMA 3R control cabinet with stainless steel components
Optional configurations for extreme cold (-55°C), seismic zones, or high-altitude environments
Certified to ANSI C37.06.1 for fast transient recovery rise times
The PB72 High Voltage Dead Tank Circuit Breaker is engineered with advanced design tools that enable rapid development of modern, high-performance switchgear with superior mechanical precision. Incorporating state-of-the-art spring and interrupter technology, it delivers the industry’s fastest operating mechanisms, highest X/R ratings, and exceptional durability under demanding electrical and environmental conditions. Tested to L30 line fault duties and certified for Definite Purpose per ANSI C37.06.1, the PB72 achieves a first-pole-to-clear factor of 1.5 at 170kV, a high asymmetry ratio of 33, and withstands 50kA short-time current tests—25% above standard—with no deformation or contact welding.
The PA Switchgear HV Circuit Breaker Advantage
Tank Cross Section
Design Features
Integral Particle Trap: Improved dielectric performance is achieved through the patented particle trap design, integral to each interrupter’s enclosure. The trap ensures that any particles or arc by-products generated during breaker operations are electrically shielded at the enclosure’s lowest point.
Integral Particle Trap/Tank Heater
Tank Cross Section
Specialized Heater Element: Unlike conventional external heaters, Pennsylvania Switchgear heaters are installed inside the tank to directly heat the SF6 gas. The heater element can be replaced within minutes without opening the tank or removing the SF6 gas.
- Integral particle trap
- Composite insulators
- Galvanized support frame
- Powder-coated NEMA 3R control cabinet
- Stainless steel door handles
- Stainless steel SF6 tubing
- Ganged SF6 monitoring
- SAE hardware
- Fully assembled shipments
- Low-temperature performance to -55˚C
- ASME Pressure Vessel Certification
- Internal tank heater
- Porcelain insulators
- Extra-high creep/high-altitude insulators
- High seismic performance
- Individually-phased SF6 monitoring
- NEMA four-hole universal positioning terminals
- NEMA 4X mechanism/control cabinet
- Custom control package
- Extra auxiliary contacts
- Custom support structure
- Side-mounted position indicator for long-distance viewing
PB72 Circuit Breaker Specifications
| Inches | A | B | C | D | E | F | G | H | J | K | L | M | N | O | P |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PB72 | 114 | 57 | 51 | 54 | 42 | 122 | 100 | 35 | 28 | 27 | 22 | 147 | 84 | 58 | 30 |
| RATINGS | PB123-40 |
|---|---|
| Standards | ANSI/IEEE |
| Maximum Voltage | 72.5 kV |
| BIL | 350 kV |
| Frequency | 60 Hz |
| 60 Hz Withstand | 160 kV |
| Short-Circuit Current | 40 kA |
| Continuous Current | 2 kA / 3 kA / 4 kA |
| Interrupting Time | 3 cycles |
| Duty Cycle | O-0.3s-CO-15s-CO |
| Temperature | −55 °C to +50 °C |
| Altitude above sea level | up to 3,300 ft |
| Seismic (IEEE 693-2005) | High |
| Normal Operating Pressure | 90 psig @ 20 °C |
| Minimum pressure to interrupt fault current | 76 psig @ 20 °C |
| Minimum pressure to interrupt load current | 76 psig @ 20 °C |
Operating Mechanism
The mechanism’s open design provides ready access to all components. It is designed to provide reliable 3-cycle performance with minimal maintenance.
Manufacturing Facility in Canonsburg, PA
