Mechanical timer replacement guide
Replacing a JAS E65-0012 or E65-0024 Mechanical Timer
If the timer in your irrigation pump, control panel or industrial equipment is marked JAS E65-0012 or JAS E65-0024, you may also see references to ISGUS ISG12, ISG24, MO12, MO24 or the KS55 timer family. This guide explains the practical replacement paths available in Australia.
What do the JAS E65 part numbers refer to?
JAS Oceania has listed two round, panel-mounted mechanical timers under the following catalogue numbers:
| JAS catalogue number | Description | Common cross-references | Bolec replacement path |
|---|---|---|---|
| E65-0012 | Mechanical 12-hour timer | ISGUS ISG12, OEX MO12, KS55 12-hour | BMT-55 12-hour mechanical timer |
| E65-0024 | Mechanical 24-hour timer — listed as obsolete | ISGUS ISG24, OEX MO24, KS55 24-hour | BCT2S electronic conversion option |
These reference numbers are particularly useful when an old timer has failed and the original equipment documentation is no longer available. However, the part number alone does not confirm the connected voltage, contact arrangement or wiring, so those details should always be checked before ordering.
JAS E65-0012 replacement: Bolec BMT-55 12-hour timer
Mechanical replacement option
BMT-55 12-hour
The BMT-55 is a dependable mechanical run-down timer used as an alternative to the ISGUS ISG12, MO12 and KS55 12-hour timer. It requires no battery, programming or external power to operate the timing mechanism.
Why customers choose it
- Mechanical wind-up operation
- Counts down without a power supply
- Automatic switching at the end of the selected time
- Suitable for irrigation pumps, valves and control panels
- Common replacement path for ISGUS-style 12-hour timers
Customers may search for the same application using several descriptions, including JAS E65-0012 replacement, E650012 timer, ISGUS ISG12 replacement, MO12 timer or KS55 12-hour timer. The label or old part number can help identify the application, but the terminal arrangement and load should still be confirmed.
JAS E65-0024 replacement: what to do when the 24-hour timer is obsolete
The JAS E65-0024 24-hour mechanical timer is listed as obsolete. There is no 24-hour version of the BMT-55, so Bolec does not recommend substituting a shorter mechanical timer where a full 24-hour range is required.
Instead, a Powerite BCT2S digital countdown timer conversion may provide a practical replacement for compatible ISGUS ISG24, MO24, KS55/24 and JAS E65-0024 applications.
12 VDC option
BCT2S 12V digital countdown timer
Suitable for compatible 12V control systems where an electronic countdown timer is acceptable.
240 VAC option
BCT2S 240V digital countdown timer
Available for compatible mains-powered control applications. Installation must be completed by a suitably qualified person.
How to identify the correct replacement
Before ordering, check the existing timer and control panel for:
- Part number: E65-0012, E65-0024, ISG12, ISG24, MO12, MO24 or KS55 markings.
- Time range: confirm whether the dial is 12-hour or 24-hour.
- Supply voltage: especially important when changing from a mechanical timer to an electronic model.
- Contact configuration and load: identify what the timer is switching and its electrical rating.
- Mounting and terminals: compare the panel opening, mounting holes, depth and wiring connections.
If the label or wiring is unclear, take clear photos of the front dial, rear terminals, side label and surrounding wiring. Bolec can review them before recommending a replacement path.
Frequently asked questions
Is the BMT-55 the same branded product as JAS E65-0012?
No. E65-0012 is a JAS catalogue reference. The Bolec BMT-55 is offered as a replacement option for compatible 12-hour mechanical timer applications; it should not be represented as a JAS-branded product.
Can the BMT-55 replace a JAS E65-0024 or ISGUS ISG24?
Not where a full 24-hour timing range is required. The BMT-55 range does not include a 24-hour model. Ask Bolec about the BCT2S electronic conversion instead.
Does the BMT-55 need a battery or external power?
No. Its timing mechanism is mechanically wound and continues to count down without a battery or external power. The equipment being controlled still requires its normal operating power.
Can I order a replacement online in Australia?
Yes. The BMT-55 and BCT2S options are available through Bolec Electronics. For uncertain applications, contact us with photos and the old part number before ordering.
Not sure which timer you have?
Send Bolec a photo of the front dial, rear connections and any part-number label. We can help identify whether you need a BMT-55 mechanical replacement or a BCT2S electronic conversion.
Email: sales@bolec.com.au
Phone: 0480 312 400
JAS, ISGUS and OEX names and part numbers are used for product identification and cross-reference purposes only. They remain the property of their respective owners. Compatibility must be confirmed for each installation.