The Auspicious AZ-7121 is a roller lever mini limit switch built to detect position and travel on machines where space is tight. A cam, dog or moving part pushes the roller, the lever swings, and the snap action contacts change over instantly. That gives a clean, positive signal every time, whether the target moves slowly or passes at speed.

Snap action is the reason this switch works so well for position sensing. The contacts do not creep open as the lever moves. They flip at a fixed point, so the switching point stays repeatable and the contacts do not arc or wear the way a slow make contact would. With an operating speed range from 0.01mm up to 50cm per second, the AZ-7121 handles both slow creeping slides and faster conveyor traffic.

The side mount body bolts flat against a machine frame, so it fits in narrow gaps where a larger enclosed limit switch cannot. The housing is oil tight and waterproof for workshop and machine tool environments. One normally open and one normally closed contact let the same switch stop a motion and send a signal to a PLC or indicator. It is rated 10A at 250VAC and 0.5A at 125VDC.

Key Features

Roller lever actuator for smooth contact with cams, dogs and moving parts
Snap action contacts give a fast, repeatable switching point
One NO and one NC contact for control and signalling from one switch
Compact side mount body for tight machine spaces
Oil tight and waterproof housing for workshop environments
10A 250VAC rating handles contactor coils and control loads
Wide operating speed range from 0.01mm to 50cm per second
CE marked and manufactured in Taiwan by Auspicious

Technical Specifications

Specification	Detail
Product Type	Side Mount Mini Limit Switch
Series	AZ Series
Model	AZ-7121
Actuator Type	Roller Lever
Switching Action	Snap Action
Contact Configuration	1NO and 1NC
AC Rating	10A 250VAC
DC Rating	0.5A 125VDC
Operating Speed	0.01mm to 50cm per second
Housing	Oil Tight and Waterproof
Mounting	Side Mount
Certification	CE Mark
Brand	Auspicious
Country of Origin	Taiwan
SKU	AZ-7121

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Common Applications

End of travel detection on machine slides and tables, conveyor position sensing, door and guard position monitoring, hoist and lift travel limits, packaging and filling machines, machine tool axis limits, gate and barrier position feedback, and any compact mechanism where a moving part must trigger a stop or a signal.

Choosing the Right Mini Limit Switch

The actuator decides how the switch meets the moving part, so match it to the motion first. A fixed roller lever like the AZ-7121 suits most cam and dog applications where the target path stays consistent. If the target position varies or you need to fine tune the trip point, an adjustable lever gives more flexibility.

For adjustable options in the same AZ series, the adjustable roller lever mini limit switch AZ8108 lets you set lever length, while the adjustable rod limit switch AZ8107 uses a long rod that reaches targets further away. Where you need a heavier duty body with a 10A rating and adjustable lever, the adjustable roller lever limit switch AZ-5108 is the step up.

If the target pushes straight in rather than across, a plunger actuator works better than a lever. The cross roller plunger mini limit switch ME-8122 handles that motion. Browse the full side mount limit switch range or the wider limit and micro switches category. For non contact sensing where physical wear is a concern, see our proximity and photo sensors.

Why Buy From Qahraba

Qahraba supplies electrical contractors, panel builders, machine builders and procurement engineers across the UAE and worldwide. Every mini limit switch we stock is genuine Auspicious product. Local UAE orders ship within 1 to 2 working days, free above AED 250, or collect free from our Dubai store. Call or WhatsApp +971 52 913 9543 for bulk pricing.

FAQ

What is a mini limit switch used for?

A mini limit switch detects the position of a moving part. When the part pushes the actuator, the contacts change state and can stop a motor, reverse a motion or send a signal to a PLC. The compact size makes it suitable for tight machine spaces.

What does snap action mean on a limit switch?

Snap action means the contacts flip over instantly at a fixed point instead of opening slowly. This gives a clean, repeatable signal and reduces contact wear and arcing.

What is the difference between a roller lever and an adjustable roller lever?

A fixed roller lever has a set length and suits applications where the target path is consistent. An adjustable lever lets you change the lever length or angle to fine tune where the switch trips.

What does 1NO and 1NC mean?

The switch has one normally open and one normally closed contact. When the lever operates, the NO contact closes and the NC contact opens, so one switch can stop a motion and send a signal at the same time.

Can this switch work on DC circuits?

Yes, but the DC rating is much lower at 0.5A 125VDC. It suits PLC inputs and small relay coils on DC but not heavier DC loads.

What does side mount mean?

The switch body has mounting holes through the side, so it bolts flat against a machine frame or bracket. This saves space compared with base mounted enclosed limit switches.

Roller Lever Mini Limit Switch Side Mount 10A Snap Action 1NO 1NC AZ-7121 Auspicious