IDEAL SWITCH [7" & 9"] ANGLE GRINDER SPARE PART - 27998
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The Ideal Switch 27998 is a precision-engineered angle grinder trigger switch spare part designed as a direct-fit replacement for 7" (180mm) and 9" (230mm) large angle grinders using a Bosch-type rear handle assembly. Built with a high-impact heat-resistant polymer housing and heavy-duty electrical contacts, this power tool switch replacement restores full operational control with an integrated lock-on/lock-off safety mechanism, making it the reliable choice for professionals and workshop technicians.
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Restore Full Power Control — Built for Heavy-Duty Grinding Demands
- Bosch-Type Ergonomic Trigger Assembly: Engineered as a direct-fit replacement switch for standard Bosch-style large angle grinder rear handle housings, ensuring a precise mechanical fit without modification. Compatible with the most widely used 7" and 9" grinder platforms in professional and industrial settings.
- Heavy-Duty Electrical Contacts for High-Load Performance: The internal contacts are rated to handle the high electrical surges generated during motor startup and sustained heavy grinding loads on both 180mm and 230mm tools. This prevents premature contact burn-out — a common failure point in inferior replacement switches.
- Integrated Spring-Loaded Safety Lock Mechanism: Features a trigger lever with a lock-on/lock-off safety mechanism that prevents accidental tool engagement during handling, transport, or disc changes. The spring-loaded design ensures positive tactile feedback and reliable switching action under repeated use.
- High-Impact Heat-Resistant Polymer Housing: The switch body is constructed from a robust heat-resistant polymer that protects internal electrical contacts from dust contamination, thermal buildup from prolonged grinding sessions, and the physical impact of jobsite drops — extending the service life of the component significantly.
- Standard Male Spade / Screw Terminal Connections: Fitted with industry-standard terminal connections that allow for straightforward wiring during installation. No specialist tools or custom adapters are required, making this a practical repair solution for both professional technicians and experienced DIY users.
- Designed for Longevity in Demanding Environments: Whether used in metal fabrication, construction, stone cutting, or surface preparation, this angle grinder switch spare part is built to withstand the vibration, heat, and electrical stress of continuous professional use — restoring your tool to factory-level performance.
This switch spare part is supplied as a single unit (1 piece) and is compatible with 7" and 9" large angle grinders using a Bosch-type rear handle configuration. The switch assembly includes the trigger lever, lock mechanism, and pre-fitted terminal connections, ready for direct installation.
General Purchase & Comparison Queries
Is this switch compatible with my angle grinder?
The Ideal Switch 27998 is compatible with 7" (180mm) and 9" (230mm) large angle grinders that use a Bosch-type rear handle housing. This is one of the most common handle configurations across professional-grade large angle grinders. If your grinder uses a trigger-style switch mounted in the rear handle with standard spade or screw terminal connections, this switch is very likely a direct fit. If you are unsure, check your grinder's model number or existing switch part number before ordering.
How does this compare to an OEM switch replacement?
The Ideal Switch 27998 is engineered to OEM-equivalent specifications, matching the mechanical dimensions, terminal layout, and electrical ratings of the original Bosch-type switch assembly. It uses heavy-duty electrical contacts and a heat-resistant polymer housing that meet or exceed the durability standards of many factory-fitted switches. For professional repair technicians, it offers a cost-effective alternative to sourcing original manufacturer parts without compromising on safety or performance.
How many switches are included in one order?
Each order includes one (1) angle grinder trigger switch assembly. The unit comes complete with the trigger lever, integrated lock-on/lock-off mechanism, and pre-fitted terminal connections — everything required for a direct installation on a compatible 7" or 9" angle grinder.
Product-Specific and Usage Queries
What does the lock-on/lock-off mechanism do?
The lock-on/lock-off safety mechanism is a critical safety feature on large angle grinders. When engaged, the lock-on function allows the tool to run continuously without the operator needing to hold the trigger — useful for extended grinding or cutting tasks. The lock-off position prevents the trigger from being accidentally depressed during handling, disc changes, or transport. The spring-loaded design ensures the mechanism engages and disengages with positive, reliable action even after prolonged use.
What type of terminal connections does this switch use?
The switch is fitted with standard male spade and screw terminal connections — the most widely used wiring interface on large angle grinders. These terminals allow for straightforward disconnection of the old switch and reconnection of the new one without requiring soldering or specialist electrical tools. Always ensure the grinder is fully disconnected from the power supply before beginning any wiring work.
Can this switch handle the startup surge of a large angle grinder motor?
Yes. The heavy-duty electrical contacts inside the Ideal Switch 27998 are specifically designed to withstand the high inrush current generated during motor startup on 180mm and 230mm angle grinders. Large angle grinder motors draw significantly more current at startup than during steady-state operation, and inferior switches often fail at this point. The robust contact design ensures reliable switching performance across thousands of on/off cycles under full load conditions.
Problem/Solution-Oriented Queries
My angle grinder won't turn on — could it be the switch?
A faulty trigger switch is one of the most common reasons a large angle grinder fails to start. If your grinder shows no response when the trigger is pressed — despite the power cable and motor being intact — the internal electrical contacts of the switch may be burnt, corroded, or mechanically failed. Before replacing, check that the power supply is live and the carbon brushes are not worn out. If those components are functional, replacing the trigger switch with the Ideal Switch 27998 is the recommended next step for a Bosch-type 7" or 9" grinder.
The trigger on my grinder feels loose or intermittent — is this the right fix?
Intermittent power delivery or a physically loose trigger are classic signs of a worn or damaged switch assembly. Over time, the spring mechanism inside the trigger can weaken, and the electrical contacts can develop micro-arcing damage that causes inconsistent contact. Continuing to use a grinder with an intermittent switch is a safety risk. Replacing it with the Ideal Switch 27998 — which features a spring-loaded trigger and heavy-duty contacts — will restore consistent, safe operation.
Will this switch fit without any modifications to my grinder housing?
The Ideal Switch 27998 is designed as a direct-fit replacement for Bosch-type rear handle housings on 7" and 9" angle grinders, meaning it should seat correctly into the handle cavity and align with the existing terminal positions without requiring drilling, cutting, or housing modification. However, minor variations can exist between grinder brands and production batches. We recommend comparing the physical dimensions and terminal layout of your existing switch with the product specifications before installation to confirm fitment.