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Rectangular metal enclosure, 2U rack height, grey finish, front switch and indicator lights

Liebert

Liebert MP2-115HW Bypass Switch accessory

SKU CH-4QRY-R2ATK MPN MP2-115HW

A 2U rack-mount bypass switch with 6 ms open-transition switching, hard-wired and NEMA 5-15 connections, 120 V AC output, 12 A rated and 15 A maximum current, over-current and surge protection.

  • DetailsSwitch Type: Open Transition Switching Time: 6 ms Plug/Conne
  • Product dimensions17 in × 3.5 in × 3.5 in
  • Maintenance bypass keeps power flowing during UPS service
  • Open-transition switching completes in 6 ms for minimal interruption
  • Hard-wired and NEMA 5-15 connections fit standard 120 V installations
  • 2U rack or tower form factor suits dense equipment layouts
  • Over-current and surge protection safeguards connected loads

Bypass Switch for Liebert UPS

The Liebert MP2-115HW is an open-transition bypass switch designed for 120 V Liebert UPS units. It provides a maintenance path that isolates the UPS while keeping connected equipment powered. The unit mounts in a 2U tower or rack form factor and includes a six-foot input cable for installation flexibility.

Suited for 120 V UPS maintenance

This accessory suits administrators who need to service a compatible Liebert UPS without interrupting the load. It is not for systems operating at voltages outside the 110 V to 120 V input range, nor for installations that require closed-transition switching. Buyers needing higher current capacity than the 15 A maximum should look at alternative solutions.

Hardwired and NEMA 5-15 connections

The switch offers both hardwired and NEMA 5-15P input with matching NEMA 5-15R output receptacles, allowing direct integration into existing power distribution. Over-current and surge protection are built in to safeguard downstream equipment during bypass operation. The six-foot cord simplifies rack placement without requiring separate cabling.

How it compares

Measured against everything we stock in UPS Replacement Batteries, at today’s prices. Recalculated every night.

Price $321.99
Pricier than about 90% of the 3,915 comparable items (median $39.99).

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Specifications

Product
Brand nameLiebert
Model nameMP2-115HW
Product typeOther
Size & build
Product dimensions17 in × 3.5 in × 3.5 in
Shipping weight5.90 kg
Package size470 × 201 × 159 mm

Questions about this item

What UPS voltage and plug type must I already have for this bypass switch to connect?

It requires a Liebert 120 V UPS with a NEMA 5-15P input and hardwired output connections.

Will the 6 ms open-transition switching interrupt power to my older rack gear during transfer?

The 6 ms break is brief enough for most legacy servers and network equipment to ride through without rebooting.

How can I confirm the switch is operating correctly after installation?

Verify the status LEDs show normal, then initiate a manual bypass; the load should transfer to utility power within the 6 ms switching window.

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