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General| Current Rating | 75A |
|---|---|
| Voltage Rating | 240VAC |
| Interrupting Capacity | 10kA |
| Standards | UL489 |
| Type | Molded Case Circuit Breaker |
| Trip Unit | Thermal Magnetic |
| Frame Size | DB |
Procedures for checking breaker condition upon receipt and before installation.
Guidelines for storing circuit breakers safely when not in immediate use.
Guidance on connecting power cables and bus bars to the circuit breaker.
Recommendations for mounting breakers within enclosures for proper fit and safety.
Details on the construction and maintenance of the breaker's pole units and contacts.
Procedures for cleaning and dressing breaker contacts to ensure proper operation.
Information on inspecting and removing the breaker's operating mechanism for maintenance.
Instructions for removing the closing solenoid coil, including safety precautions.
Overview of the overcurrent tripping device, its types, construction, and removal.
Step-by-step guide for adjusting the trip screw for proper breaker tripping.
Explanation of the operation and time-current characteristics of the standard overcurrent trip.
Details on the operation and characteristics of the selective overcurrent tripping device.
Description of the instantaneous trip device and its operation.
Explanation of time-current curves for the standard overcurrent tripping device.
Explanation of time-current characteristics and adjustments for selective overcurrent trip units.
Information on the control relay, its function, contacts, and maintenance.
Details on the shunt trip attachment, its purpose, and maintenance.
Explanation of the undervoltage trip attachment and its operation when voltage falls.
Information on the undervoltage time delay attachment and its air dashpot adjustment.
Details on the auxiliary switch, its contacts, and maintenance procedures.
Description of the alarm switch attachment and its integration with tripping operations.
Function and inspection of the electric lockout attachment to hold the breaker open.
Instructions for using the key lock attachment to secure the breaker in a specific position.
Details on the key interlock attachment for securing breaker position and preventing key removal.
Information about the rectifier unit used with AC electric lockout attachments.
Explanation of the reverse current trip attachment for DC equipment protection.
Details on the field discharge switch mounted on the DBF-40 breaker.
List of recommended spare parts for DB-75 and DB-100 Air Breakers with quantities.
Table of standard ratings, including continuous current and interrupting capacity for DS breakers.
Detailed technical ratings and operating characteristics for DS circuit breakers.
