Instructions

Marine Electrical Prod ucts
7244/7246/7248/7250/7250I/7267/7268/7269/7270/7271
Panel Specifi cations
Circuit Breaker Type: Magnetic
Body Material: Phenolic
Interrupt Rating DC: 10,000 Amperes @<=80 Volts DC 5-100 Amps
5,000 Amperes @<=65 Volts DC 150-300 Amps*
5,000 Amperes @ 48 Volts DC 100 Amps
Rated Switch Cycles: 10,000 ON-OFF with rated current and voltage
C-Series Toggle Circuit Breaker
• 50 to 300 Ampere range provides overcurrent protection previously only
available in fuses for: Inverters/Bow Thrusters/Windlasses
• Combines switching and circuit protection into a single device
• “Trip Free” - Cannot be held closed after trip
Applicable Standards
• American Boat and Yacht Council (ABYC) Standards and Recommended
Practices for Small Craft sections: E-1, E-3, E-9.
• United States Coast Guard 33 CFR Sub Part 1, Electrical Systems.
Agency Standards
• Meets SAE J1171 external ignition protection requirements - 7250I only
* No Agency Approvals
Blue Sea Systems Inc. Phone [phone]
425 Sequoia Drive Fax [phone]
Bellingham, WA 98226 USA [e-mail]
www.bluesea.com
Document 9743 Rev.F
WARNING
@It is not possible within the scope of these instructions to fully acquaint
the installer with all the knowledge of electrical systems that may be
necessary to correctly install this product. If the installer is not
knowledgeable in electrical systems we strongly recommend that an
electrical professional be retained to make the installation.
@If either the C-Series Toggle Circuit Breaker front or back is to be
exposed to water it must be protected with a waterproof shield.
@The C-Series Toggle Circuit Breaker must not be installed in explosive
environments such as gas engine rooms or battery compartments as
the circuit breakers are not ignition proof.
@The main positive connection must be disconnected at the battery post
to avoid the possibility of a short circuit during the installation of this
circuit breaker.
Guarantee
Any Blue Sea Systems product with which a customer is not satisfi ed
may be returned for a refund or replacement at any time.
Useful Reference Books
Calder, Nigel, 1996: Boatowner’s Mechanical and Electrical Manual, 2nd
edition, Blue Ridge Summit, PA: TAB Books, Inc.
Wing, Charlie, 1993: Boatowner’s Illustrated Handbook of Wiring,
Blue Ridge Summit, PA: TAB Books, Inc.
Related Products from Blue Sea Systems
PanelBack Insulating Covers
High Amperage Fuses and Circuit Breakers for positive feed wires
High Amperage Battery Switches
Terminal Blocks and Common Bus Connectors
AC Distribution Panels
DC Distribution Panels
AC and DC Digital and Analog Voltmeters and Ammeters
1. Calculate the maximum sustained amperage of the circuit. Measure
the length of the circuit from the power source to the load and back.
2. Decide whether the circuit runs in an engine space or non engine
space. Engine spaces are assumed to be at 50 degrees C, non engine
spaces are assumed to be at 30 degrees C.
3. Multiply the maximum current times the length of the circuit to calculate
Famps (feet x amps).
4. Base the wire on either the 3% or 10% voltage drop. In general, items
which affect the safe operation of the boat and its passengers (running
lights, bilge blowers, electronics and distribution panel supply circuits)
use 3%; all other loads use 10% (cabin lights, bait pumps).
5. Starting in the column which has the right voltage and voltage drop
shown at the top, run down the list of numbers until arriving at a value
which is greater than the calculated Famps. Move left to the Ampacity
column to verify that the total amperage of the circuit does not exceed
the maximum allowable amperage of the wire size for that row. If it
does, move down until the wire ampacity exceeds the circuit
amperage. Finally, move left to the wire size column to select the wire
size.
Examples
a. A 12 volt system at 10% drop with a 40’ circuit x 45 amps = 1800
Famps. A wire size of 8 is required.
b. A 24 volt system at 3% drop with a 10’ circuit x 100 amps = 1000
Famps. A wire size of 6 is required.
C-Series Toggle Circuit Breakers
for High Load Applications
Note: For wire with 105°C insulation rating and AWG wire sizes.
Chart courtesy of the West Advisor.
Wire Sizing Chart