Blue Sea Systems 7251 C-Series Double Pole Toggle Circuit Breaker, 50A, 120/240V AC / 80V DC

The Blue Sea Systems 7251 is a C-Series double pole toggle circuit breaker rated at 50 amps, designed to protect 120/240 volt AC circuits and DC systems up to 80 volts. It is frequently used as an AC main circuit breaker to switch both hot and neutral, or two hot lines, in 120/240 volt AC branch applications. Because it is a double pole design, both poles trip together if either pole experiences an overcurrent fault, ensuring the entire circuit is de-energized rather than leaving one leg live.

The breaker uses a magnetic hydraulic, trip-free mechanism, meaning it cannot be held in the ON position during a fault current condition, and it is rated for 10,000 switching cycles at its rated amperage and voltage. Connections are made via a 1/4"-20 tin-plated brass terminal stud torqued to 35 in-lb maximum, and the breaker mounts using an included #6-32 stainless steel screw torqued to 6-8 in-lb. It operates across a wide temperature range, from -40 F to 185 F, making it suitable for marine environments exposed to heat and cold.

Finished in white, the 7251 is part of the Blue Sea Systems C-Series family of double and triple pole toggle breakers, which share the same magnetic hydraulic trip-free design and voltage ratings across the amperage range.

Specifications

• Brand: Blue Sea Systems
• Manufacturer Part Number: 7251
• Color: White
• Current Rating: 50 Amps AC
• Number of Poles: 2
• Maximum Voltage: 80V DC
• Voltage, Nominal Operating: 120/240V AC
• Minimum Operating Temperature: -40 C (-40 F)
• Maximum Operating Temperature: 85 C (185 F)
• Switching Cycles: 10,000 cycles at rated amps and volts
• Type: Magnetic Hydraulic, Trip Free
• Terminal Stud: 1/4"-20 Tin-Plated Brass
• Terminal Stud Torque: 35 in-lb maximum
• Mounting Screw: #6-32 Stainless Steel (included)
• Mounting Screw Torque: 6-8 in-lb recommended
• Weight: 0.7 pounds

Frequently Asked Questions

What is the amperage rating of the Blue Sea Systems 7251 circuit breaker? The 7251 is rated at 50 amps AC, part of the Blue Sea Systems C-Series double pole toggle breaker lineup.

How many poles does the 7251 circuit breaker have? The 7251 is a double pole (2-pole) circuit breaker, meaning it switches two conductors, such as hot and neutral, or two hot lines in a 120/240 volt AC branch circuit.

What is the maximum voltage rating for the Blue Sea Systems 7251? The 7251 carries a maximum DC voltage rating of 80V DC, with a nominal AC operating voltage of 120/240V AC.

Can the 7251 breaker be used on both AC and DC circuits? Yes, the Blue Sea Systems 7251 is rated for 120/240V AC nominal operation and up to 80V DC maximum, making it suitable for both AC and DC marine circuits within those limits.

What happens if only one pole of the 7251 trips? Because the 7251 is a double pole breaker, it will trip all poles together if any single pole experiences an overcurrent condition, fully de-energizing the protected circuit.

What is the operating temperature range of this breaker? The Blue Sea Systems 7251 operates from a minimum of -40 C (-40 F) up to a maximum of 85 C (185 F).

How is the 7251 circuit breaker wired and mounted? Wiring connects via a 1/4"-20 tin-plated brass terminal stud torqued to 35 in-lb maximum, and the 7251 mounts with an included #6-32 stainless steel screw torqued to 6-8 in-lb recommended.

How many switching cycles is the 7251 rated for? The 7251 is rated for 10,000 switching cycles at its rated amperage and voltage.

What color is the Blue Sea Systems 7251? The 7251 circuit breaker is finished in white.

How much does the 7251 circuit breaker weigh? The Blue Sea Systems 7251 weighs 0.7 pounds.

Is the 7251 a trip-free circuit breaker? Yes, the 7251 uses a magnetic hydraulic, trip-free design, meaning it cannot be held in the ON position during a fault current condition.

What is the difference between the 7251 double pole breaker and a triple pole version? The 7251 is a double pole breaker used to switch hot and neutral or two hot lines; a triple pole version in the same C-Series family is used as a 120/240V AC main circuit breaker to switch both line conductors and neutral. Both double and triple pole versions trip all poles together if any one pole trips.