BATTERY SWITCHES
AFD Explained
AFD is short for Alternator field Disconnect. The AFD is a second switch inside the battery switch, yet electrically isolated from it. The AFD switch closes before the battery switch contacts close and opens before they open. It is connected in the field wire between the voltage regulator and the alternator, preventing the alternator from producing power when the AFD switch is open. Its purpose is to protect the alternator diodes, which can be damaged if the alternator is producing power and the battery switch is suddenly turned off.
Battery Switch Amperage Ratings
A battery switch amperage rating means nothing without also specifying time and temperature, for the amperage rating is the current that the switch can conduct for a specified time without exceeding a specified temperature.
To compare amperage ratings between various switches there must be a common standard of time and temperature. That standard is UL standard 1107 which defines these two important amperage ratings:
Continuous Duty Rating: Amperage that can be conducted for 1 hour without raising the terminal temperature more than 100 degrees C or the housing temperature more than 65 degrees C
Intermittent Duty Rating: Amperage that can be conducted for 5 minutes without raising the terminal temperature more than 100 degrees C or the housing temperature more than 65 degrees C
Battery Switches that do not adhere to this standard or rate at very short time periods such as 10 seconds cannot be compared to those of manufacturers adhering to UL 1107
Compact High Amperage Switches
Luminous label for low light readability300 Amp rating-25% higher than most switches
Vapor proof/ignition protected
Optional AFD switch on 9002 and 9004 models
Case design allows surface or flush mounting
Specifications
UL Listing: 508. UL Continuous duty rating: 300 Amperes
UL Intermittent duty rating: 400 Amperes. Voltage rating: 32 Volts DC Maximum
Case Material: Lexan Polycarbonate. Stud Terminal Size: 3/8"
Cat #
Part #
Description
Our
Price
15517
9001
Switch Battery 4 Position
$34.99
15518
9002
Switch Battery 4 position with AFD
$36.99
15519
9003
Switch Battery ON/OFF
$32.99
15520
9004
Switch Battery ON/OFF with AFD
$34.99
Mini Battery Switches
· Luminous label for low light readability
· Vapor proof/ignition protected
· Case design allows surface or flush mounting
· Key is removable, yet positively retained at all times
Cat #
Part #
Description
Our
Price
15521
9005
Switch ON/OFF (Key)
$16.99
15522
9006
Switch ON/OFF (Knob)
$18.99
15523
9664
Spare Key
$5.99
Specifications
Continuous Duty Rating: 250 Amperes
Intermittent Duty Rating: 375 Amperes
Voltage Rating: 32 Volts DC Maximum
Case Material Lexan Polycarbonate
Stud Terminal Size: 3/8"
ROCKER SWITCHES
Contura Switch
Specifications
· Rating 12 VDC 20 Amperes
· Lighted: LED Rated 1000,000 hours ½ life
· Seals: Internal and external gasket panel seal
· Temperature rating: -40 C to 85C
· Mounting hole: 1.450" x 0.830" (36mm x 21.08mm)
Cat #
Part #
Description
Our
Price
150401
8234
SPDT (on)-off-(on)
$16.75
15050
8233
SPDT (on)-off-on
$13.95
15051
8232
SPDT on-off-on
$13.95
15052
8231
SPST off-(on)
$13.95
15053
8230
SPST off-on
$9.35
( ) = Momentary position
