Lift Car Top Limit Switch LX-21 Normally Open Normally Close Switch Over Speed Protection Elevator Spare Parts

Functions of LX-21 Elevator Limit Switch
Anti-Collision & Anti-Overrun ProtectionPrevents elevator from over-top (running too high) and bottoming (running too low) when control system fails.
Final Safety Cut-OffActs as the last safety protection after deceleration switch and limit switch fail.
Safety Circuit InterruptionWhen triggered, it cuts off the safety circuit, forces the contactor to release and brake to lock instantly.
Upper & Lower Limit ControlInstalled at top/bottom of hoistway to stop car at extreme positions.
Mechanical Reliable ProtectionCompletely mechanical structure, works even when electricity or PCB fails.
Fault MonitoringIf damaged or not reset, elevator cannot run and will show safety fault.

Elevator Overspeed Governor – FAQs

Q1: What is the purpose of an elevator overspeed governor?
An elevator overspeed governor is a safety device designed to detect excessive speed and initiate the specified protective response, including operation of the safety gear where applicable.

Q2: Can an elevator overspeed governor be replaced with a different model?
A different model may be considered only after verifying rated speed, tripping characteristics, rope specifications, safety gear coordination, and applicable approval requirements.

Q3: What is the relationship between an elevator overspeed governor and safety gear?
The overspeed governor and safety gear form part of a coordinated protection system. Their operating characteristics must be compatible to achieve the intended protective function.

Q4: Does an elevator overspeed governor require periodic inspection?
Yes. Inspection and testing requirements depend on applicable regulations, the equipment manufacturer, and the maintenance program. Work should be performed by qualified personnel.

Q5: What specifications are needed for an elevator overspeed governor replacement?
Please provide the original model, nameplate, rated speed, tripping speed, governor rope specifications, safety gear details, and elevator model.

About Xi’an Sulab Machinery

Xi’an Sulab Machinery Co., Ltd. supplies elevator and escalator parts and supports elevator modernization projects for customers worldwide.
Our main business covers three areas: elevator parts, escalator parts and elevator modernization. Depending on the product and application, we supply both genuine parts and compatible replacement parts for various equipment models. Our product range includes parts for systems from brands such as Otis, KONE, Sigma, Hyundai, Canny, BLT and IFE.
We help customers identify suitable parts by checking the equipment model, part number, nameplate and product photos. For modernization projects, we source components or systems according to the existing equipment, technical requirements and project scope. We also support OEM escalator and moving-walk projects based on customer specifications.
We serve elevator and escalator maintenance companies, parts distributors and project contractors across North America, South America, the Middle East, Southeast Asia, Africa and Europe. Before shipment, we confirm product details with the customer and arrange suitable packaging and shipping according to the product, destination and delivery requirements. Tracking information is provided after dispatch.
To request a quotation, please send us the part name, equipment model, part number, required quantity or clear product photos. Our team will review your requirements and get back to you.