Solenoid coils
Replacement solenoid coils and connectors for hydraulic and pneumatic valves: 12 and 24 V DC, 110 and 220 V AC.
When a valve does not work, the cause is usually a burnt coil, not the valve itself; replacing the coil gets the machine running without removing the valve. We stock coils in common voltages and sizes and find the equivalent from the dimensions or the label of the existing coil.
Types
DC solenoid coils
12 V and 24 V DC; used in mobile hydraulics, truck mounted systems and circuits driven by a PLC.
AC solenoid coils
110 V and 220 V AC; used on industrial machines supplied directly from the mains.
Coil connectors
Connectors that make the electrical connection of the coil; types with LED indicator and with rectifier are also available.
How to select
In coil selection four things have to match together: the voltage and current type (DC or AC), the inside diameter of the coil (the diameter of the valve stem), the coil length and the connector type. If one of them does not match, the coil either does not fit the stem or does not shift the valve.
Voltage and current type are not interchangeable. If an AC coil is supplied with DC of the same voltage, only the winding resistance is left to limit the current and the coil burns out quickly; if a DC coil has to be run on AC, a connector with rectifier is used.
The quickest way is to send us the voltage and dimensions from the label of the old coil, or a photo of it; we recommend the equivalent from stock.
Current draw by solenoid coil power
| Voltage | Coil power | Current |
|---|---|---|
| 12 V DC | 18 W | 1.50 A |
| 12 V DC | 26 W | 2.17 A |
| 24 V DC | 18 W | 0.75 A |
| 24 V DC | 26 W | 1.08 A |
| 110 V AC | 30 VA | 0.27 A |
| 220 V AC | 30 VA | 0.14 A |
Calculation: current = power ÷ voltage. The power values are examples; the actual value is on the coil label. On an AC coil the inrush current at the moment of pull-in is several times higher than the holding current given in the table; this margin is allowed for when selecting fuses and relays. At the same power, a 12 V DC coil draws twice the current of a 24 V DC coil.
Frequently asked questions
How can I tell if a solenoid coil is burnt out?
If the valve does not shift and the coil does not magnetize although voltage reaches it, or if there are burn marks on it, the coil may be burnt out; measuring the winding resistance confirms it.
Can I fit a 24 V DC coil in place of a 220 V AC coil?
Only if the supply voltage of the machine is also 24 V DC. The coil is selected according to the voltage and current type that supplies it.
How do I find the right solenoid coil?
It is enough to send the label of the old coil, or the voltage, inside diameter and length; we recommend the equivalent from stock.
Why do solenoid coils burn out?
Common causes are wrong voltage (for example an AC coil supplied with DC), an AC coil drawing high inrush current continuously because the valve stem is stuck, moisture and excessive temperature.
Why does the inside diameter of the coil matter?
The coil slides over the valve stem; if the inside diameter and the length do not match, the coil either does not fit or cannot pull the plunger with enough force.
What are the LED and the rectifier in a coil connector for?
A connector with LED shows that voltage is reaching the coil and makes fault finding easier. A connector with rectifier converts alternating current to direct current, so that a DC coil can run on an AC supply.
What do NG06 and NG10 coils mean?
NG06 and NG10 are the mounting interface sizes of modular hydraulic valves (CETOP 3 and CETOP 5). The coils of these valves also come in their own standard sizes; when selecting a coil, the inside diameter and length of the coil are checked together with the nominal size of the valve.
Why is IP65 protection important for a solenoid coil?
IP65 means that the coil is dust tight and protected against water jets from any direction. This rating should be required on machines working outdoors and in plants washed down with pressurized water.
Stock, sizes and part numbers
Sizes in stock, manufacturer part numbers and brands are kept up to date in our catalog. Send us your requirement on WhatsApp or by e-mail and we will quote and ship worldwide.