New, used, & obsolete electrical solutions. Through our extensive network of suppliers, we are able to carry and acquire a huge variety of electrical products and solutions, so chances are if you need it, we can get it. The electro-magnetic field in the rotor is produced by the rotating field of the stator. SPECIAL OFFERS Like other induction motors, the squirrel cage motor consists of: When the motor draws excess current, it is referred to as an overload. We list it on our site because we do sell replacement parts for this unit.
While you can always replace it with a new product from Eaton, you don’t have to give up your preferred Westinghouse relay. We try to always offer you the lowest prices possible, Unlike the bimetallic and eutectic overload relays, these electronic overload relays measure current electronically. In the the overload relay, the eutectic alloy is contained in a tube, which is often used along with a spring loaded ratchet wheel to activate the tripping mechanism during the overload operations. 1-888-757-4774. If the current rises above a certain limit over a certain period oftime, then the overload relay will trip, operating an auxiliary contact which interrupts the motor control circuit, de-energizing the contactor. However, it is possible that some information in these white papers is incomplete, incorrect, or inapplicable to particular circumstances or conditions. Many overload relays include bimetallic elements or bimetallic strips, also referred to as heater elements. The motor current passes through the small heater winding. * Free slots for orders with water heaters, boilers and other bulky items only. which requires that products used in any system providing water for human consumption (drinking or cooking) to meet low-lead standards. Look for other informative papers from c3controls at c3controls.com/blog. The practice of engineering is driven by site-specific circumstances unique to each project. We are proud to stock a variety of competitively priced, new and reconditioned components from the leading manufacturers of Westinghouse Overload Relays. Trip Class 5 is suited for motors that demand fast tripping, whereas Class 10 is usually preferred for motors of low thermal capacity like submersible pumps.
This type of overload relay is comprised of a heater winding, a mechanical mechanism for activation of a tripping mechanism, and a eutectic alloy. The overload relay is wired in series with the motor, so the current that flows to the motor when the motor is operating also flows through the overload … which requires that products meet low-lead standards in order to be used in systems providing water for human consumption (drinking or cooking). This action initiates the opening of the closed auxiliary contacts in the overload relay. Without power, the motor and motor circuit components do not overheat and become damaged. After which, the motor can be restarted. Bimetallic overload relays are often specified when automatic reset of the circuit is required, and occurs because the bimetal has cooled and returned to its original state (form).
They get their name because the rotor resembles the rotating cylindrical “cage” that you might find in a pet squirrel or hamster cage. You must agree to this statement in order to purchase this product. Don’t get rid of them just yet. TeSys LRD Thermal Overload Relay (23-32A, 690V, Class 20) LR3D32L TeSys LRD Thermal Overload Relay (23-32A, 690V, Class 20) SKU: LR3D32L. These devices may be powered by AC or DC sources.
There are two main types ofinduction motors — single-phase induction motors and three-phase induction motors. We pride ourselves on the relationships we build with our customer-first mentality and the quality of our Westinghouse Overload Relays and components. As a result, the contactor coil circuit is interrupted.The amount of heat generated can be calculated by the Joule’s Law of Heating. This design helps reduce the costs and efforts of installation. Keep in touch with us! Feel free to send us a message and we will follow up during our normal business hours: Do not use this item for any installation or repair of potable water applications. If you have problems accessing your account, please contact us at 1-888-757-4774 and we'll help you out. Blowers, fans, compressors, cranes, extruders, and crushers are a few important devices equipped with electric motors. These relays are commonly referred to as electronic overload relays. The overload relay is wired in series with the motor, so the current that flows to the motor when the motor is operating also flows through the overload relay. These relays also provide protection from phase loss – more effectively than bimetallic or eutectic alloy overload relays. Overload Relays: Types & Tripping & What is Overload Protection. The rotor of the three-phase induction motor is classified as phase wound rotor or slip ring rotor and squirrel cage rotor. Please check the box below to confirm you are aware that this item is for non-potable water applications only. © Copyright 2020 Bay Power Inc. All Rights Reserved. Class 10 and 20 are employed for general purpose applications, whereas Class 30 is employed for loads with high inertia. They open the starting circuit and cut the power to the motor if it begins to draw too much current for an extended … Solid state overload relays enable easy adjustment of trip times and set points. By checking this box I am verifying that this product will be installed by a qualified/licensed contractor and will be set up with properly calibrated combustion test equipment. In other words, the lower the current, the longer it will take the overload relay to trip and the higher the current, the faster the overload relay will trip, in fact it will trip much faster because the operation of the relay is a function of the current squared. Add item to cart for lowest price. The overload relay can be reset manually, and some overload relays will reset automatically after a certain period of time. For product availability in your area, please verify your zip code. Eutectic overload relays can only be manually reset after tripping.
Disclaimer:The content provided in this white paper is intended solely for general information purposes and is provided with the understanding that the authors and publishers are not herein engaged in rendering engineering or other professional advice or services. In addition, the heaterless design is insensitive to the change in ambient temperatures, which helps minimize nuisance tripping.
A Westinghouse overload relay … However, the metal with a high coefficient of expansion will expand more in comparison to the metal with a low coefficient of expansion. Induction motors equipped with a squirrel cage rotor are known as squirrel cage induction motors. This product must be installed by a qualified/licensed contractor and set up with properly calibrated combustion test equipment. It is important to be careful during the selection of an overload relay, because repeated tripping and reset can reduce the mechanical life of the relay and may cause damage to the motor. This dissimilar expansion of the bimetallic strips causes the bimetal to bend towards the metal with a low coefficient of expansion.As the strip bends, it actuates an auxiliary contact mechanism and causes the overload relay normally closed contact to open. At this time, we do not carry this unit. Great service shouldn’t end after the purchase. The above equation defines that heat produced by the winding will be directly proportional to the time period of the flow of overcurrent through the winding. Thanks to our extensive inventory of Westinghouse Overload Relays and components, our resourceful and expertly trained staff will always be able to get the products that you need. This product does not comply with the Safe Drinking Water Act, To see the price, simply add the item to your cart or
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