CBS MaxiVac’s™ new Tough Duty™ line of roll-in replacement circuit breakers replaces aging Power/Vac® breakers without any modifications to existing cells or switchgear. The Tough Duty™ breakers are tested per ANSI/IEEE certification standards, are available in all standard ratings, and include the newest replacement encapsulated pole assemblies from Vacuum Interrupters, Inc. Encapsulated poles harden your breakers against environmental contamination, extending the life of your power distribution equipment.
Tough Duty™ Circuit Breaker Advantages
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- Direct Roll-In Replacement
- Meets or Exceeds ANSI/IEEE Testing Standards
- 5-year, 3,000-Operation Warranty
- New Rugged Encapsulated Vacuum Interrupter Pole Design
- Mechanism Made In USA
- Extended Warranties Available
- Utilizes Trusted ML-17 and ML-18 Mechanisms
Tough Duty™ Circuit Breaker Benefits
Direct Roll-In Replacement. Roll-in replacement requires no cell or wiring modifications, avoiding switchgear replacement and downtime costs.
ANSI/IEEE C37 Tested. The circuit breaker has been tested to the latest applicable ANSI/IEEE C37 standards, including C37.09.
Mechanism Made In USA. Trusted ML-17 and ML-18 mechanisms have been remanufactured to ISO standards, including OEM recommendations and service advisories.
Safety First. Maintains existing maintenance and safety procedures; works with existing remote racking and switching equipment.
Repetitive Duty Upgrade. Need more than 3,000 operations? Ask about our Repetitive Duty Upgrade warranty.
Upgraded Pole Assemblies. New encapsulated pole assemblies are rugged, can extend existing interrupt capabilities, and have a longer service life than legacy pole designs.
Tough Duty™ Models & Ratings
Click to Download PDF with all Model & Rating Information
Click to Download PDF Order Form
Model Identification & Replacement Part Number
| Replacement Tough Duty™ Part Number |
Original Model Number |
Normal rms Voltage Class (kV) |
Normal 3-phase Class (MVA) |
| VBTD-5-250-12 | VB-4.16-250 | 4.16 | 250 |
| VBTD-5-250-20 | |||
| VBTD-5-350-12 | VB-4.16-350 | 350 | |
| VBTD-5-350-20 | |||
| VBTD-8-500-12 | VB-7.2-500 | 7.2 | 500 |
| VBTD-8-500-20 | |||
| VBTD-15-500-12 | VB-13.8-500 | 13.8 | 500 |
| VBTD-15-500-20 | |||
| VBTD-15-750-12 | VB-13.8-750 | 750 | |
| VBTD-15-750-20 |
Replacement Part Rated Values
| Identification | Rated Values |
|||||
| Replacement Tough Duty™ Part Number |
Voltage | Insulation Levels | Current | |||
| Rated Maximum Voltage (kV) | Rated Voltage Range Factor (K) | Rated Withstand Test Voltage | Continuous rms Current Ratings (A) |
Short Circuit rms Current Rating (at Rated Max kV) (kA) |
||
| Low Frequency rms Voltage (kV) |
Crest Impulse Voltage (kV) |
|||||
| VBTD-5-250-12 | 4.76 | 1.24 | 19 | 60 | 1200 | 29 |
| VBTD-5-250-20 | 2000 | |||||
| VBTD-5-350-12 | 1.19 | 1200 | 41 | |||
| VBTD-5-350-20 | 2000 | |||||
| VBTD-8-500-12 | 8.25 | 1.25 | 36 | 95 | 1200 | 33 |
| VBTD-8-500-20 | 2000 | |||||
| VBTD-15-500-12 | 15 | 1.3 | 1200 | 18 | ||
| VBTD-15-500-20 | 2000 | |||||
| VBTD-15-750-12 | 1200 | 28 | ||||
| VBTD-15-750-20 | 2000 | |||||
Replacement Part Related Required Capabilities
| Identification | Related Required Capabilities | |
| Replacement Tough Duty™ Part Number | Maximum Symmetrical Interrupting & 3-sec Short Time Capability Rating (kA) |
Closing and Latching Capability rms Current (kA) |
| VBTD-5-250-12 | 36 | 58 |
| VBTD-5-250-20 | ||
| VBTD-5-350-12 | 49 | 78 |
| VBTD-5-350-20 | ||
| VBTD-8-500-12 | 41 | 66 |
| VBTD-8-500-20 | ||
| VBTD-15-500-12 | 23 | 37 |
| VBTD-15-500-20 | ||
| VBTD-15-750-12 | 36 | 58 |
| VBTD-15-750-20 | ||
