Product Overview
Magnetrol 89-7101-020 Mercury Switch Relay - Direct Replacement for Float Level Controls
Condition
Unused NOS. The switch mechanisms are in excellent, pristine condition. Manufacturer's packaging shows corner crush and surface wear on the boxes; contents are clean and undamaged. Box label confirms Part Number 89-7101-020, Made in U.S.A. Photo observations show molded bodies marked BZ-2RW80 with brass lever actuators and three white AWM-labeled leads with fork terminals. Date codes 9335 and 0335 are visible on individual units. Sourced from a government research facility.
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Product Overview
Magnetrol 89-7101-020 is a mercury switch relay designed as a direct replacement component for Magnetrol liquid level controls. It fits into float-operated external cage level switch assemblies, restoring the original switching function when the existing mercury switch has failed. When liquid level changes move the magnetic float, the switch actuates and signals the process control system. Rated 15A 125/250/480V-AC and confirmed Made in U.S.A.
Key Features
- Direct replacement mercury switch relay for Magnetrol level control units
- Rated 15A at 125/250/480V-AC; 1/2A at 125V-DC; 1/4A at 250V-DC - confirmed from visible markings
- Black molded body with brass hinge-lever actuator
- Three white AWM CSA 150C leads with fork terminals
- Date codes 9335 and 0335 visible on units; MICRO S marking confirmed in photos
- Manufactured in the U.S.A. - confirmed on box label
- Replaces failed switch mechanism without replacing the full level control assembly
Applications
- Replacing a failed mercury switch inside an existing Magnetrol external cage float level switch - disconnecting power, swapping the 89-7101-020 into the original mounting position, and restoring process level detection without pulling the full control
- Maintenance rebuilds on Magnetrol level controls in petroleum refining, petrochemical, or power generation facilities where the float mechanism is intact but the switch has worn out
- Keeping a spare on the shelf for critical level control points where unplanned downtime is not acceptable - swap in minutes instead of waiting on procurement
- Bench restoration of Magnetrol level switch assemblies pulled from decommissioned process lines for reuse in lower-criticality applications
Frequently Asked Questions
What Magnetrol level control units does the 89-7101-020 fit?
The 89-7101-020 is a replacement mercury switch relay designed for Magnetrol float-operated external cage liquid level switch assemblies. Verify the exact model of your existing Magnetrol unit to confirm compatibility before ordering.
Is this the mercury switch or the full level control assembly?
This is the switch mechanism only - not the full level control. It installs inside an existing Magnetrol level control unit to replace a failed switching element. The float body, cage, and enclosing tube are not included.
What are the electrical ratings on this switch?
Ratings confirmed from visible markings on the units: 15A at 125/250/480V-AC; 1/2A at 125V-DC; 1/4A at 250V-DC.
Are there mercury-free alternatives I should consider?
This part contains mercury. Depending on your facility's environmental and safety regulations, mercury-containing switches may be restricted or require special disposal handling. Confirm compliance requirements for your site before ordering.
What is the condition of the packaging?
The switch mechanisms are unused and in excellent condition. The outer boxes show corner crush and surface wear consistent with long-term storage - the contents are undamaged.
A working Magnetrol level control with a dead switch is one swap away from being fully operational again. This is the part that gets the line running without the cost of a full assembly replacement.
