
AM-CBS21A Comparison
| photo | price | summary | rating |
|---|---|---|---|
![]() | $11.10 | Condition is New, Ampper Top Post Battery Disconnect Switch 12V, 1 Pack, W/ Bolt , FREE SHIPPING | 100.0% |
![]() | $25.75 | Condition is New, Ampper Top Post Battery Disconnect Switch 12V, 2 Pack, W/ Bolt , FREE SHIPPING | 99.0% |

The AMPPER AM-CBS21A Top Post Battery Disconnect Switch Master Isolator is a versatile and essential automotive component designed to provide safe and convenient battery disconnection for various maintenance tasks and diagnostic procedures. This premium switch, manufactured by AMPPER, is engineered to meet the stringent requirements of modern vehicles and is suitable for use in cars, trucks, vans, and other types of automobiles.
The AM-CBS21A Top Post Battery Disconnect Switch Master Isolator is a master isolator switch, which means it can be used to disconnect the battery from the electrical system of the vehicle while also allowing the use of accessories that require power even with the battery disconnected. The switch is designed as a top post type, allowing it to be installed securely on the battery terminal post. The device comes with a 14-inch long, 10-gauge, red insulated jumper cable that connects the switch to the battery terminal.
The AM-CBS21A Top Post Battery Disconnect Switch Master Isolator is constructed from high-quality materials, ensuring durability and resistance to harsh environmental conditions. The switch body is made from a rugged, impact-resistant thermoplastic material, while the contacts are made from heavy-duty, corrosion-resistant bronze. The switch lever is large and easy to operate, providing a secure and positive engagement.
The AM-CBS21A Top Post Battery Disconnect Switch Master Isolator is designed with safety in mind. When the switch is in the "ON" position, the battery is connected to the electrical system, providing power to the vehicle. When the switch is moved to the "OFF" position, the battery is disconnected from the electrical system, effectively isolating it from the rest of the vehicle. This feature is crucial for safety during maintenance tasks and diagnostic procedures, as it prevents accidental activation of the starter motor or other potentially hazardous components.
The AM-CBS21A Top Post Battery Disconnect Switch Master Isolator is easy to install, requiring no modifications to the vehicle's wiring system. The switch comes with clear installation instructions, and the necessary mounting hardware is included in the package. The switch can be installed on the battery terminal post using the included mounting bracket, ensuring a secure and stable installation.
In summary, the AMPPER AM-CBS21A Top Post Battery Disconnect Switch Master Isolator is a high-quality, versatile, and essential automotive component that provides safe and convenient battery disconnection for various maintenance tasks and diagnostic procedures. Its rugged construction, easy operation, and safe design make it an indispensable tool for any automotive enthusiast or professional mechanic.
The AMPER AM-CB21A Top Post Battery Disconnect Switch Master Isolator M8 is a crucial accessory for managing your vehicle's electrical system. This switch allows you to safely disconnect the battery from the electrical system when performing maintenance or troubleshooting. Here are the pros and cons of buying this product:
Pros:1. Safety: The master isolator switch ensures that all accessories and systems are disconnected from the battery when the switch is in the off position. This eliminates the risk of accidental electrical shorts or shocks.
2. Convenience: The top-post design allows for easy installation and access to the switch. It can be installed in various locations, including under the dashboard or in the engine bay.
3. Durability: The switch is made of high-quality materials, including a weatherproof housing and corrosion-resistant contacts. This ensures that it can withstand harsh environmental conditions and heavy use.
4. Versatility: The switch can be used on a wide range of vehicles, including cars, trucks, and RVs. It can also be used for other applications, such as solar panel systems and marine applications.
Cons:1. Cost: The AMPER AM-CB21A Top Post Battery Disconnect Switch Master Isolator M8 is more expensive than some other battery disconnect switches on the market.
2. Complexity: The switch has multiple positions, including off, on, and accessory, which may require some additional explanation and learning for some users.
3. Size: The switch is larger than some other battery disconnect switches, which may require more space for installation.
Conclusion:The AMPER AM-CB21A Top Post Battery Disconnect Switch Master Isolator M8 is a high-quality and versatile product that offers excellent safety features and convenience. Its durability and weatherproof design make it suitable for a wide range of applications, including automotive, marine, and solar power systems. While it may be more expensive than some other options, its superior performance and reliability make it a worthwhile investment.
Recommendation:If you are looking for a reliable and versatile battery disconnect switch, the AMPER AM-CB21A Top Post Battery Disconnect Switch Master Isolator M8 is an excellent choice. Its safety features, convenience, and durability make it a worthwhile investment for anyone who needs to manage their vehicle's electrical system. While it may be more expensive than some other options, its superior performance and reliability make it a smart investment for anyone who values safety and convenience.
Details:
Compatible: used for top post terminal, 15-17mm cone battery negative only, dc 12 v system, rated current: 125 a, on/off 2 position. Loose / twist of the knob, then power will cut. Knob type, easy to install simple use. Ampper top post knob type battery disconnect master switch for marine car boat RV ATV vehicles, specifications: 1, used terminal, 15-17mm cone negative only.
Purpose: used for battery to isolate and secure the electrical system, eliminate any power draw from when vehicle or boat is not in use, disconnects safely. Heavy duty: solid made, rust and corrosion resistant, durable made for safety use. Used for car, vehicle, RV and boat batteries which have a standard 15-17mm cone top post terminal, also used electrical equipment. Convenience: with m8 top bolt for multiple methods of battery cable connection.
specifications indusswitch:
- brand: Ampper
- mpn: Am-cbs21a
- model: Ampper-bds125-12v-tp-tb
- part type: Top Battery Switch
- current rating: 125 Amps
- control method: Touch
- terminal: Top Post
- operating voltage: 12 Volts
- contact material: Stainless Steel
- special features: Eliminate Any Power Draw From The Battery When Vehicle Or Boat Is
- unit count: 1.0 Count
- product dimensions: 3.3 X 1.5 X 1.5 Inches
- circuit type: 2-way
- is discontinued by manufacturer: No
- connector type: Female
- item weight: 4.4 Ounces
- color: Top Post W/ Top Bolt
- operation mode: Manual
- actuator type: Rotary
- contact type: Normally Open
- switch type knob: Mounting Type Panel Mount
- size: 1 Pack
- upc: 445036455425
returns indusswitch:
- time: 30 days
- paid by: seller
- policy: returns accepted
- method: money back
seller indusswitch:
- rating: 0.0%
- # reviews: 0
- city: denver, colorado
general indusswitch:
- category: Business & Industrial > Electrical Equipment Supplies > Switches > Accessories
payments indusswitch:
- wallet: paypal
- credit card: discover
- other
offer indusswitch:
- options: ship-to-home
- in stock #: 2
- prices: $11.10–$25.75
- item condition: New
- availability: in stock
- started: may 4, 2025
- sold #: 21
shipping indusswitch:
- type: fixed
- service: expedited
- class: expedited
- transit: 4-8 days
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