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Description
Rotary 9664 Plunger Interlock Switch – Multi-Application Normally Closed Safety Switch
The Rotary 9664 Plunger Interlock Switch is a premium aftermarket multi-application safety switch designed for use on a wide variety of lawn mowers, zero-turn mowers, riding mowers, garden tractors, and commercial outdoor power equipment. This single-post, right-angle snap-in mounted, normally closed plunger switch is a direct replacement for many OEM safety interlock switches, helping maintain proper operator presence, brake, and PTO safety functions.
Manufactured with durable electrical components and a rugged housing, the Rotary 9664 Interlock Switch is built to provide dependable electrical performance in demanding residential and commercial environments. Whether you're replacing a faulty safety switch or performing preventive maintenance, this replacement switch delivers reliable operation and an easy installation.
Product Features
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Part Number: 9664
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Product Type: Plunger Interlock Safety Switch
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Single-post design
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Right-angle snap-in mounting
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Normally Closed (NC) configuration
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Heavy-duty electrical contacts
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Durable weather-resistant housing
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Direct replacement for numerous OEM applications
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Designed for dependable safety system performance
Compatible Equipment
The Rotary 9664 Plunger Interlock Switch replaces numerous OEM part numbers used by many leading outdoor power equipment manufacturers, including:
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Scag
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Toro
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Exmark
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John Deere
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Husqvarna
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Cub Cadet
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MTD
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Snapper
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Simplicity
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Murray
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Wright
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Great Dane
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Bolens
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Troy-Bilt
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Garden Way
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And many more.
Common OEM Replacements
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Scag: 48717
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Toro: 74-0275
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Exmark: 740275
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John Deere: AM104403
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Cub Cadet / MTD: 725-3166, 925-3166
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Husqvarna: 532121305, 532421062
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AYP / Sears: 121305X, 532121305
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Wright: 524-10001
Always verify your original part number, terminal configuration, and mounting style before ordering.
Benefits
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Reliable replacement for worn safety switches
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Helps maintain proper PTO and operator presence safety functions
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Durable construction for long service life
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Easy snap-in installation
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Compatible with numerous mower brands
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Ideal for residential and commercial equipment
Ideal For
Perfect for:
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Professional landscapers
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Commercial mowing contractors
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Equipment repair technicians
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Fleet maintenance professionals
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Lawn mower repair shops
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Homeowners maintaining riding mowers
Recommended Applications
Ideal for:
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Seat safety switch replacement
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PTO safety circuits
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Brake interlock systems
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Operator presence controls
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Lawn mower electrical repairs
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Preventive maintenance
Specifications
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Brand: Rotary
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Part Number: 9664
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Product Type: Plunger Interlock Switch
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Switch Type: Normally Closed (NC)
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Mounting Style: Right-angle snap-in
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Terminal Configuration: Single Post
Why Buy from Barry's Power Equipment?
Barry's Power Equipment is your trusted source for premium replacement parts and commercial outdoor power equipment accessories.
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Quality Replacement Parts
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Fast Shipping Throughout the USA
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Competitive Pricing
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Expert Customer Support
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Trusted by Professional Landscapers
Keep your equipment operating safely with the Rotary 9664 Plunger Interlock Switch. Designed for dependable performance across multiple mower brands, this high-quality replacement safety switch helps restore critical interlock functions and reliable equipment operation.




