Wiktor Wise
Electric brakes are a type of braking system that can be powered by standard trailer wiring without modifying the tow vehicle. The amperage requirements for electric brakes vary depending on the size and type of brake magnet used. For example, a 7-inch brake magnet typically draws a maximum of 3.2 amps, while a 10 or 12-inch brake magnet can draw up to 4 amps. In a double-axle brake system, the maximum amperage draw during an emergency stop can reach 16 amps. It's important to consider the amperage requirements when designing or modifying brake systems to ensure adequate power supply and optimal braking performance.
| Characteristics | Values |
|---|---|
| Amperage of each electric brake magnet | 3.0 to 3.2 amps at 12 to 13 volts for 7-inch brake magnets |
| Amperage of each electric brake magnet | 3.2 to 4.0 amps at 12 to 13 volts for 10 and 12-inch brake magnets |
| Maximum amperage draw for brake magnets on a single-axle trailer (2 brakes) with 7-inch brake system | 6.3 to 6.8 amps |
| Maximum amperage draw for brake magnets on a single-axle trailer (2 brakes) with 10 and 12-inch brake system | 7.5 to 8.2 amps |
| Amperage draw for a 7-inch brake magnet | 2.5 amps |
| Amperage draw for all other brake magnets | 3 amps |
| Maximum amperage draw for 4 brakes that are 10 or 12 inches in diameter | 15.0 to 16.3 amps at 12 to 13 volts |
| Amperage draw for Elecbrakes | Up to a maximum of 16 amps |
| Amperage rating of 14 gauge wire by the National Electrical Code | 20 amps of current at 30 degrees ambient temperature |
| Amperage draw for a brake-away brake switch | 5 amps |
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What You'll Learn
Electric trailer brake amperage requirements
Electric trailer brakes draw different amounts of power depending on the size of the brake magnet. The amperage draw on a 7-inch brake magnet is 3.0 to 3.2 amps maximum at 12 to 13 volts, while a 10 or 12-inch brake magnet draws 3.2 to 4.0 amps maximum at the same voltage. This means that a double-axle brake system with 7-inch brake magnets would draw a maximum of 6.3 to 6.8 amps, while a double-axle system with 10 or 12-inch brake magnets would draw a maximum of 7.5 to 8.2 amps. For a tandem trailer with four 10 or 12-inch brake drums, the maximum amperage draw is 15.0 to 16.3 amps at 12 to 13 volts.
The National Electrical Code rates 14-gauge wire as providing an allowable ampacity of 20 amps at 30 degrees Celsius ambient temperature, which is sufficient for most electric trailer brake applications. However, some sources recommend using a larger wire gauge, such as 10 or 12-gauge wire, to ensure maximum braking effectiveness and accommodate longer trailers that require more wire.
It is important to note that the actual load on the circuit is typically much less than the maximum capacity. For example, a trailer-mounted Elecbrakes solution draws up to a maximum of 16 amps of current from the car battery, despite being connected to a 10-amp circuit. This highlights the importance of considering the specific requirements and characteristics of the electric trailer brake system when determining the amperage and wiring needs.
To measure the brake current accurately, the engine of the towing vehicle should be running. The wire can be disconnected at the desired measurement point, and an ammeter can be connected in series to measure the current draw. It is crucial to ensure that the ammeter has sufficient capacity and that polarity is considered to prevent potential damage to the meter. Additionally, if a resistor is present in the brake system, it must be set to zero or bypassed to obtain the maximum amperage reading.
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Electric brake controller amperage
The amperage requirements for electric brake controllers are determined by various factors, including the size of the brake magnet, the number of axles, and the voltage.
For instance, a 7-inch brake magnet typically draws a maximum amperage of 3.0 to 3.2 amps at 12 to 13 volts. On the other hand, 10-inch and 12-inch brake magnets have a higher amperage range, with a maximum draw of 3.2 to 4.0 amps at the same voltage. Consequently, a double-axle brake system with larger magnets can draw up to 16 amps during an emergency stop.
It is important to note that while there is no absolute standard for trailer brake amp requirements, trailer component manufacturers have established common practices. The National Electrical Code, for example, rates 14-gauge wire as providing an allowable ampacity of 20 amps at 30 degrees Celsius ambient temperature, which is sufficient for electric brake controllers.
To ensure optimal performance and safety, it is recommended to use larger wires for longer trailers. For instance, a 10-gauge wire is commonly used for trailer brake installations, even on single-brake axles with 7-inch brake assemblies, as it provides more capacity and improves the effectiveness of the trailer brake system.
The Elecbrakes trailer-mounted electric brake controller is a notable innovation in this field. It is powered entirely through standard trailer wiring, eliminating the need for costly modifications to the tow vehicle. This controller can be mounted on any trailer and used with any compatible vehicle, offering convenience and flexibility to users.
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Electric brake magnets and wire size
The amperage draw of an electric brake magnet depends on its size. On a 7-inch brake magnet, the amperage draw is 3.0 to 3.2 max amps at 12 to 13 volts. The amperage increases to 3.2 to 4.0 max amps at 12 to 13 volts for 10 and 12-inch brake magnets. Therefore, the maximum amperage draw for the brake magnets on a single-axle trailer with two brakes would be 6.3 to 6.8 amps on a 7-inch brake system and 7.5 to 8.2 amps on a 10 or 12-inch brake system. The amperage will be higher for tandem axle or triple-axle trailers.
The wire size for connecting electric brakes to a 7-way trailer plug depends on the colour of the wire. The suggested minimum wire gauge for the white (ground) wire, the red or black (power) wire, and the blue (brake power) wire is 12 gauge. However, some recommend using a minimum of 12-gauge wire and preferably 10-gauge wire for 10" brake assemblies as they pull more power than the lights on the trailer. The National Electrical Code rates 14-gauge wire as providing an allowable ampacity for 20 amps of current at 30 degrees ambient temperature.
The Elecbrakes system is a trailer-mounted electric brake controller that is powered by standard trailer wiring without the need for modifications to the tow vehicle. The smart controller inside Elecbrakes reads the excess amperage available in the tail light and brake light circuit, drawing up to 8 amps of spare electricity per circuit, for a total of 16 amps of available current for the electric brake magnets. This provides ease of installation and the ability to tow a braked trailer with any compatible vehicle.
It is important to note that there is no absolute standard for amp requirements on trailer brakes, and the amperage requirements are determined based on extensive testing, customer experience, and information gathered from trailer component manufacturers.
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Electric brake amperage and trailer plugs
Electric brake amperage varies depending on the size of the brake magnet and the number of axles in the trailer. For instance, a 7-inch brake magnet typically draws 3.0 to 3.2 amps at 12 to 13 volts, while a 10 or 12-inch brake magnet can draw up to 4.0 amps at the same voltage. This means that a single-axle trailer with two 7-inch brake magnets would have a maximum amperage draw of 6.3 to 6.8 amps, while a single-axle trailer with 10 or 12-inch brake magnets would draw up to 8.2 amps.
The amperage requirements for electric brakes are determined based on extensive testing, customer experience, and information from trailer component manufacturers. While there is no absolute standard for amp requirements, it is recommended to use a 10 or 12-gauge wire for 10-inch brake assemblies as they pull more power than the lights on the trailer.
For a tandem trailer with four 10 or 12-inch brake drums, the maximum amperage draw is 15.0 to 16.3 amps at 12 to 13 volts. A 14-gauge wire may be sufficient, but for maximum braking effectiveness, a 10-gauge wire is recommended.
Elecbrakes has revolutionized the industry by developing a trailer-mounted electric brake controller that can be powered through standard trailer wiring without modifying the tow vehicle. This eliminates the need for costly modifications and allows any compatible vehicle to tow a trailer with electric brakes. The Elecbrakes solution draws up to a maximum of 16 amps of current from the car battery, which is well within the allowable ampacity of 20 amps for 14-gauge wire as per the National Electrical Code.
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Electric brake amperage and trailer weight
Electric brakes draw different amperages depending on the size of the brake magnet. For instance, on 7-inch brake magnets, each magnet draws 3.0 to 3.2 amps at 12 to 13 volts, while 10 and 12-inch brake magnets draw 3.2 to 4.0 amps at 12 to 13 volts. This means that a single-axle trailer with two 7-inch brake magnets will draw a maximum amperage of 6.3 to 6.8 amps, while a single-axle trailer with two 10 or 12-inch brake magnets will draw 7.5 to 8.2 max amps. The amperage will be higher for tandem axle or triple-axle trailers.
The amperage requirements for electric brake systems are determined based on extensive testing, customer experience, and information from trailer component manufacturers. While there is no absolute standard for trailer brake amperage requirements, common practices are followed by trailer component manufacturers. It is recommended to use a minimum of 12-gauge wire for electric brake assemblies, but preferably 10-gauge wire, as they pull more power than the lights on the trailer.
The Elecbrakes system is a notable innovation in this space, as it can power its electric brake controller through standard trailer wiring without needing to hardwire into the tow vehicle. This eliminates the need for costly modifications to the tow vehicle and allows users to tow a braked trailer with any compatible vehicle. The Elecbrakes smart controller reads the excess amperage available in the tail light and brake light circuit, drawing up to 8 amps of spare electricity per circuit and providing a total of 16 amps of available current for the electric brake magnets.
For trailer brakes that are not powered by an innovative system like Elecbrakes, the power is typically supplied through a separate cable. In this setup, a power cable runs from the battery to the controller, and a control cable runs from the controller to the trailer connector and then to the trailer brakes. The controls to regulate the trailer brake amperage are hard-mounted into the dashboard of the tow vehicle. This setup restricts the vehicle and trailer to a mutually exclusive relationship.
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Frequently asked questions
Electric brake magnets typically draw between 3.0 and 4.0 amps at 12 to 13 volts. The amperage depends on the size of the brake magnet, with 7-inch magnets drawing up to 3.2 amps and 10 or 12-inch magnets drawing up to 4.0 amps.
The maximum amperage draw for four 10 or 12-inch diameter brake drums is 15.0 to 16.3 amps at 12 to 13 volts.
A single-axle trailer with two electric brake magnets will draw a maximum of 6.3 to 6.8 amps for a 7-inch brake system and 7.5 to 8.2 amps for a 10 or 12-inch brake system.
A double-axle brake system will draw a maximum of 16 amps for a full emergency stop.
A brake-away brake switch typically draws 5 amps.
