<p>I'm resurrecting a printer I inherited.</p>
<p>Can anyone tell me if the Type A Machines Series 1 Pro heated bed has a thermal fuse in it?</p>
<p>It's a 120 VAC bed and I'd like to protect from a possible short-circuit failure of the SSR. The company is out of business and I haven't been able to find schematics or info on the web.</p>
<p>Below are three pictures of the heat bed. The first is a top view. <a href="https://i.sstatic.net/p7or3.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/p7or3.jpg" alt="Top view of TypeA heated build plate" /></a>The second is a bottom view.<a href="https://i.sstatic.net/bP4xK.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/bP4xK.jpg" alt="Bottom view of TypeA heated build plate" /></a>The third is a back view showing the place where the heater/thermistor cable enters the four-layer heat bed, which comprises (top-to-bottom in this image) an aluminum plate, a gray foam, a reddish layer that appears to be a silicone heater, and a glass plate. (The foam is absent only in this corner where the cable enters the build plate.) <a href="https://i.sstatic.net/tVhVI.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/tVhVI.jpg" alt="Back view of TypeA heated build plate" /></a></p>

CC BY-SA 4.0
2024-01-31T20:47:20.313Z
Sounds interesting. A photo of the heated bed, might be useful. A photo of the board could also be useful in identifying any fuse on the board itself. Please [edit] and update your question. FWIW, Type A Machines went out of business on [Jan 2018](https://3dprint.com/205217/untold-story-of-type-a-machines). Have you looked to see if there is a thermal fuse or two attached to the underside of the heated bed? That seems more likely than having an *embedded* thermal fuse.
Greenonline
CC BY-SA 4.0
2024-01-31T23:17:19.587Z
I don't know this printer, but seeing as it is quite old, from 2015, I would *guess* that any fuses would be on the main board rather than *integrated* into the heated bed itself (and the heated heat is probably just a PCB). . What makes you think that there is a thermal fuse (embedded) within the board? Just out of interest, do you know of *any* heated beds that have integrated thermal fuses? I'm not aware of any, although there may be as I haven't kept up to date with heated bed technology (since ~2017), so I am probably wrong, and others may know better.
Greenonline
<heated-bed>
Does Type A Machines Series 1 Pro heated bed have a thermal fuse?
Wapscawion
# Does Type A Machines Series 1 Pro heated bed have a thermal fuse?

(Asked by: username_0 on 2024-01-31)

I'm resurrecting a printer I inherited.

Can anyone tell me if the Type A Machines Series 1 Pro heated bed has a thermal fuse in it?

It's a 120 VAC bed and I'd like to protect from a possible short-circuit failure of the SSR. The company is out of business and I haven't been able to find schematics or info on the web.

Below are three pictures of the heat bed. The first is a top view. [![Top view of TypeA heated build plate](https://i.sstatic.net/p7or3.jpg)](https://i.sstatic.net/p7or3.jpg)The second is a bottom view.[![Bottom view of TypeA heated build plate](https://i.sstatic.net/bP4xK.jpg)](https://i.sstatic.net/bP4xK.jpg)The third is a back view showing the place where the heater/thermistor cable enters the four-layer heat bed, which comprises (top-to-bottom in this image) an aluminum plate, a gray foam, a reddish layer that appears to be a silicone heater, and a glass plate. (The foam is absent only in this corner where the cable enters the build plate.) [![Back view of TypeA heated build plate](https://i.sstatic.net/tVhVI.jpg)](https://i.sstatic.net/tVhVI.jpg)

**Tags:** heated-bed

> **Comments:**
> **username_1**: Sounds interesting. A photo of the heated bed, might be useful. A photo of the board could also be useful in identifying any fuse on the board itself. Please [edit] and update your question. FWIW, Type A Machines went out of business on [Jan 2018](https://3dprint.com/205217/untold-story-of-type-a-machines). Have you looked to see if there is a thermal fuse or two attached to the underside of the heated bed? That seems more likely than having an *embedded* thermal fuse.  
> **username_1**: I don't know this printer, but seeing as it is quite old, from 2015, I would *guess* that any fuses would be on the main board rather than *integrated* into the heated bed itself (and the heated heat is probably just a PCB). . What makes you think that there is a thermal fuse (embedded) within the board? Just out of interest, do you know of *any* heated beds that have integrated thermal fuses? I'm not aware of any, although there may be as I haven't kept up to date with heated bed technology (since ~2017), so I am probably wrong, and others may know better.  

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