Mager 25A AC/DC SSR for AC Heated Bed


  • Control your AC bed with a SSR just like your stock bed!
  • Upgrade the low quality Tornado SSR to eliminate interference with ABL sensors
    • Direct replacement for Tornado SSR
  • 100% Compatible with our EZABL kit – Tested to work
  • Handles up to 25A AC Current
  • Can be operated on 3-32V DC
    • Works with a Raspberry Pi GPIO – Tested to work by TH3D
  • Comes with safety cover for SSR
  • Genuine Mager SSR w/ Brass Screw Terminals

In stock

Purchase this product now and earn 10 Benchies!

Product Info

Wiring Information:

Note – It is HIGHLY recommended to use a fuse or breaker on the line input to prevent shorts if they occur. Also use the ground wire to ground the frame of the printer. Crimp terminals should be used to connect the wires to the SSR.

Technical Specifications:

Load Current25A
Load Voltage  (Output Voltage)24-480VAC
Control Voltage  (Input Voltage)3-32VDC
Control CurrentDC 3-25mA
ON Voltage≤1.5V
OFF Leakage Current≤2mA
Reaction time≤10mS
Dielectric Strength2500VAC
Insulation Resistance1000MΩ/500VDC
Ambient Temperature-30 to 80 C deg
Status IndicatorLED

Teardown Pictures

While we have awesome suppliers we always check that what we’re getting is correct. Below are pictures from our teardown of these SSRs. Inside is a JST24A Triac (datasheet) rated for 25A. Unlike other sellers out there we make sure we are getting you correct and safe products, especially on parts that handle mains voltage that can be fatal if not correctly used.

Appearance Change Note: There are 2 versions of the Mager SSR that we carry. Both are the same specs but Mager has updated their housing to a new design in late 2019. Version shipped depends on stock, again technical specifications and wiring are all the same. This was a cosmetic change. Click here to see the other version of the SSR.

Full Wiring Diagram using 15A Breaker for extra safety


Warranty & Support Information

Technical Support: TH3D Community Support

  • To get technical support with this product it is handled through our TH3D Communities
  • Technical support is not included through the TH3D Helpdesk at no charge
    • You are welcome to ask quick questions about a Community Support product through our helpdesk but in-depth 1 on 1 technical support is not included.
  • If you require require a more personalized level of technical support it can be purchased separately in 1 hour blocks of time. Contact Us to get a time-slot paid for and scheduled through one of our technicians.

Warranty Info: 90 Days Warranty

  • Our warranty covers any and all defects with the product.
  • If your product fails or has problems within the warranty period you can contact our support team by emailing or by using the Contact Us link.
    • This is for warranty related issues only, not technical support.
  • Damage/Failure due to improper installation, usage, failure resulting from an issue with the machine the product is installed on, and/or modification or the product is not covered under warranty


Best Sellers

Share your thoughts!

Let us know what you think...

What others are saying

  1. Question

    John Kalaigian

    Hello, curious to know if this SSR is a worthy mate for a Keenovo 120V 750W pad for my CR-10S. Thanks!

    (0) (0)

    Something wrong with this post? Thanks for letting us know. If you can point us in the right direction...

    • Tim Hoogland

      Yes it will! We’ve even used them on the 1500W S5 heaters. It handles it with no issue.

      (0) (0)

      Something wrong with this post? Thanks for letting us know. If you can point us in the right direction...

    • Rob Semenoff (verified owner)

      What gauge wire should be used?

      (0) (0)

      Something wrong with this post? Thanks for letting us know. If you can point us in the right direction...

    • Tim Hoogland

      Depends on how many amps your bed pad uses. Typically 14 gauge would be used for up to 15A current draw and will cover anything under 15A as well. I would not recommend using anything lower than 16 gauge for an AC bed. If you want to be sure what gauge to use contact the manufacturer of the heated bed pad and see what they recommend. We only sell the SSR, not the pads. The SSR is rated for up to 25A current which is more than enough for the heated bed pads used on 3D printers.

      (0) (0)

      Something wrong with this post? Thanks for letting us know. If you can point us in the right direction...




Your personal data will be used to support your experience throughout this website, to manage access to your account, and for other purposes described in our privacy policy.

Continue as a Guest

Don't have an account? Sign Up