A Blue Sea electrical connection post can have one large stud, two separate large posts, or two studs joined on a common bus. Those are different functions even when the stud threads look similar. Use the part number, number of terminals, terminal sizes and original wire layout to identify a replacement.
Identify the terminal layout
2016, 2017 and 2018 provide large terminal posts with red and black insulators. Used for extension points and large cable-lug connections.
2019 uses two 3/8-inch studs on a common tin-plated copper bus, rated to 200 A at up to 48 V DC.
2101, 2102 and 2103 pair a central large power stud with smaller screw connections on a 150 A bus.
Dual PowerPost 2016, 2017 and 2018
These models are identified by the stud pair, not their insulating cover colour alone.
Identify the 2019 common-bus PowerBar
| MPN | Design | Stud threads | Published rating |
|---|---|---|---|
| 2019 | PowerBar | Two 3/8–16 studs on common bus | 200 A; 48 V DC max |
Unlike a pair of individual posts, the 2019's two terminals share an electrical bus. Make sure that connection is appropriate to the intended circuit before replacing a Dual PowerPost arrangement.
PowerPost Plus 2101 through 2103
| MPN | Design | Main stud threads | Published rating |
|---|---|---|---|
| 2101 | PowerPost Plus | One 1/4–20 × 1 in stud | 150 A; 48 V DC max |
| 2102 | PowerPost Plus | One 5/16–18 × 3/4 in stud | 150 A; 48 V DC max |
| 2103 | PowerPost Plus | One 3/8–16 × 3/4 in stud | 150 A; 48 V DC max |
The manufacturer specifies #8–32 screw connections for the smaller conductors and an insulating cover with the PowerPost Plus models. The 150 A current rating belongs to the connection bus, not to every individual attached wire.
Confirm the original cable layout before replacement
Check stud-hole sizes in the original ring terminals, insulator condition, cable gauge, terminal count and which connections are electrically common. Disconnect power and follow the manufacturer’s approved torque and circuit-protection instructions.
A 200 A PowerBar and a 150 A PowerPost Plus have different connection layouts and are not interchangeable with separate harness-extension posts. Confirm the complete circuit before moving cables between them.
Find Blue Sea PowerPost and PowerBar MPNs
Open the exact MPN for the current product details and availability.
Blue Sea 2016
A dual-post harness-extension set using 5/16-inch terminals.
Check listing and availability
Blue Sea 2017
Two 3/8-inch connection posts, not a PowerPost Plus junction.
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Blue Sea 2102
Five-sixteenths central stud with small-wire screw connections.
Check listing and availability
Blue Sea 2103
Large 3/8-inch central stud in the 150 A PowerPost Plus family.
Check listing and availabilityRelated marine electrical identification
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