contactor coil voltage
- Thread starter mgerton13
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Help Support Homebrew Talk - Beer, Wine, Mead, & Cider Brewing Discussion Forum:
The first question to answer is whether you plan to run 3 wire or 4 wire into the box. If you use 4 wire, you can use either 120 or 240 coil voltage as both are available in the box. If you run 3 wire, there is no 120v.
postalbunny
Well-Known Member
Most people are going to try and use 120v contactors as there are more readily avail... cheaper to get some used and/or replaced.
But like Bobby said you need that neutral wire in your box to get 120v. So you end up having to run 4 wire (two hots, neutral, and grnd). That may cost more for cabling and the breaker. If you're only 3wire then you're limited, and need to use 220v coils. A lot of people power their 120v pumps so we start out planning that way anyhow.
But like Bobby said you need that neutral wire in your box to get 120v. So you end up having to run 4 wire (two hots, neutral, and grnd). That may cost more for cabling and the breaker. If you're only 3wire then you're limited, and need to use 220v coils. A lot of people power their 120v pumps so we start out planning that way anyhow.
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I'd be willing to bet the DIY kits aren't supplying 2-pole SSRs. You might consider running L2 directly from the contactor to the element, and running L1 from the contactor to one of the switched terminals on the SSR, and then from the other switched terminal to the element. Amazon has SSRs with coil voltages ranging from 3.3VDC to 240VAC. Do some research based on how you intend to control the SSR before purchasing. Otherwise, you should go with the DIY kit to make sure you get appropriate components.
