Leviton Twist-Lock Locking Plug, 125/250V AC Multi-Rated
The Leviton Twist-Lock Locking Plug is engineered for dependable power connections on equipment that demands a secure, vibration-resistant termination. This locking plug is rated 125/250-Volt AC, with a multi-rated design covering 3-Amp at 125-Volt AC-L, 3-Amp at 250-Volt AC, and 6-Amp at 125-Volt AC applications, giving electricians and facility teams flexibility across common low-amperage circuits. Built by Leviton, a recognized name in commercial and industrial wiring devices, this locking plug is intended for professional installations where a standard straight-blade plug would be prone to accidental disconnection.
Key Features
- Dual-Voltage Rating: Rated 125/250-Volt AC for use across multiple circuit configurations.
- 3-Amp at 125-Volt AC-L: Supports low-amperage locking connections at 125-Volt AC.
- 3-Amp at 250-Volt AC: Rated for 250-Volt AC circuits at 3-Amp load.
- 6-Amp at 125-Volt AC: Additional rating for 6-Amp loads at 125-Volt AC.
- Twist-Lock Design: Locking blade configuration helps prevent accidental disconnects in demanding environments.
- Leviton Build Quality: Manufactured by Leviton for use in commercial and industrial wiring applications.
Technical Specifications
- list_batch: LEV-20260730
- Voltage Rating: 125/250-Volt AC
- Amperage Rating: 3-Amp at 125-Volt AC-L / 3-Amp at 250-Volt AC / 6-Amp at 125-Volt AC
Typical Applications
- Commercial and Industrial Power Connections
- Portable Equipment and Machinery Cord Sets
- Locking Receptacle and Plug Combinations
- Facilities Requiring Secure, Vibration-Resistant Connections
- Renovation and New Construction Electrical Work
Why Leviton?
Leviton locking plugs are built to deliver a secure mechanical connection for equipment where reliability matters. With multiple voltage and amperage ratings supported in a single locking plug, this device gives contractors and facility managers a versatile option for professional-grade electrical work.
Manufacturer Resources
Technical Information
Product Specs
- Product Type:
- Locking Plug
- Amperage Rating:
- 3A
- Voltage Rating:
- 125/250V
- Poles:
- 1
- Product Color:
- Black
- Department:
- Electrical
- Product Group:
- Wiring Devices
- Product Subgroup:
- Plugs & Connectors
Leviton 1689-50 – Frequently Asked Questions
1) What amperage and voltage will the Leviton 1689-50 locking plug actually carry?
The Leviton 1689-50 Twist-Lock plug is multi-rated: 3A at 125V AC-L, 3A at 250V AC, and 6A at 125V AC. Voltage rating on the device is 125/250V. These are low-amperage ratings, so it is for control circuits, small portable equipment, and light cord sets, not a 15A or 20A tool or appliance circuit.
2) I need a locking plug for a 20A or 30A piece of equipment. Is this the right Leviton plug?
No. The 1689-50 tops out at 6A at 125V and 3A at 250V, so it should not be used on a 20A or 30A circuit. For 20A locking service, look at the Eaton Safety Grip locking plug rated 20A 120/208V or the Pass & Seymour 267 Series 20A rubber dust-tight plug. For 30A at 250V, the Eaton L6-30 two-pole three-wire plug is the one to specify.
3) Is the Leviton 1689-50 a single-pole locking plug?
Yes, it is a 1-pole device. That matters when you are matching it to an existing locking receptacle: a single-pole plug will not mate with a two-pole configuration such as an L6-30 or a NEMA L8 480V device like the Pass & Seymour L720P Turnlok. Match the pole and wire count on the receptacle already installed.
4) The Leviton 1689-50 locking plug is rated 3A at 125/250V. What locking plug should I use for a 15A 125-volt cord set instead?
The Leviton 1689-50 is a low-amperage device, rated 3A at 125V AC-L, 3A at 250V AC, and 6A at 125V AC, so it is not the plug for a general-purpose 15-amp cord set. For a 15A 125V connection, the Bryant 4722N is an angle locking plug in the NEMA L5-15P configuration rated 15A 125V. Note that the L5-15P is a two-pole three-wire 125-volt-only pattern, so it does not carry the dual 125/250-volt rating the Leviton device does.
5) What locking plug do I use on a 480-volt three-wire circuit if the Leviton 1689-50 is only 125/250V?
The Leviton 1689-50 is rated 125/250V AC and cannot be applied at 480 volts. The Pass and Seymour L720P is a Turnlok NEMA L8 locking plug, three-wire, rated 480V, which is the configuration used on 480-volt three-wire connections. Confirm the receptacle on the equipment matches the L8 pattern before ordering, since the two devices are not interchangeable in any configuration.
6) Why use a twist-lock plug instead of a standard straight-blade plug on portable equipment?
A twist-lock blade configuration rotates into the receptacle and holds mechanically, so vibration or a pulled cord will not drop the connection. That is the reason to spec the Leviton 1689-50 on machinery cord sets and portable equipment where a straight-blade plug would work loose. Straight-blade is fine for fixed, low-movement loads; locking is for anything that shakes, gets dragged, or must not disconnect.
7) Can I use the Leviton 1689-50 on a 250V circuit as well as 120V?
Yes, it is rated for both: 3A at 250V AC and up to 6A at 125V AC, with a device voltage rating of 125/250V. That dual rating is why one part can cover both low-amperage 120V and 240V control or equipment drops in the same building, which simplifies what an MRO crib has to stock.
8) Is the Leviton 1689-50 locking plug suitable for a wet or dust-exposed location?
The Leviton 1689-50 is a black 125/250V AC multi-rated Twist-Lock plug intended for commercial and industrial equipment cord sets where a straight-blade plug could shake loose. If the environment itself is the concern, the Pass and Seymour 2675-2675 is a 267 Series 20A rubber dust-tight locking plug in yellow, and the Eaton 7765 is an industrial armored locking plug rated 50A 600V with back-wiring and an extra heavy duty grade. Those are built around enclosure and body construction; the Leviton is the low-amperage multi-rated option.
9) For a 20-amp 120/208V locking plug on portable equipment, what is the alternative to the Leviton 1689-50?
The Leviton 1689-50 is a multi-rated plug covering 3A at 125V AC-L, 3A at 250V AC, and 6A at 125V AC, which puts a 20-amp 120/208V load above it. The Eaton 7411-C is a Safety Grip locking plug rated 20A 120/208V with a heavy-duty specification grade, built as an industrial grade device. The Safety Grip body is the grip-style cord housing rather than the compact low-amperage form of the Leviton.
10) Is a Bryant 7 Series non-metallic locking plug a drop-in replacement for the Leviton 1689-50?
No. The Bryant 71020NP is a 7 Series non-metallic locking plug, a different series and body construction from the Leviton 1689-50, which is a black Twist-Lock plug rated 125/250V AC at 3A. Locking plugs mate only with the matching NEMA configuration, so a plug from another series will not seat in the same receptacle unless the blade pattern is identical. Match the configuration on the equipment receptacle rather than substituting by brand.
11) What color is the Leviton 1689-50 plug body?
Black. If you are color-coding circuits in a facility, note that some locking plugs are supplied in high-visibility colors instead, such as the yellow Pass & Seymour 267 Series rubber plug, so a black body will not match a yellow-coded run.
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Does the Leviton 1689-50 come with a warranty?
Absolutely. The Leviton 1689-50 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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