White plastic mounting plate for Pentair IntelliChem transformer, with four standoffs and a black switch.
Pentair 521335Z transformer with mounting plate, yellow coil and red, black, white, brown wires in gray enclosure.
Close-up of the orange two-pin connector on the Pentair IntelliChem transformer&
Close-up of four stripped wire leads (brown, white, blue, black) from the Pentair transformer, 521335Z, with twisted ends.
White plastic mounting plate for Pentair IntelliChem transformer, with four standoffs and a black switch.
Pentair 521335Z transformer with mounting plate, yellow coil and red, black, white, brown wires in gray enclosure.
Close-up of the orange two-pin connector on the Pentair IntelliChem transformer&
Close-up of four stripped wire leads (brown, white, blue, black) from the Pentair transformer, 521335Z, with twisted ends.
Pentair Pool Products and Parts

Pentair Transformer with Mounting Plate for IntelliChem Chemical Controller | 521335Z

$233.99
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SKU:
521335Z

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About This Item

The Pentair Transformer with Mounting Plate (521335Z) is the OEM replacement transformer assembly for the IntelliChem Chemical Controller system, restoring proper low-voltage power delivery to the controller when the original transformer has failed.

The transformer steps down line voltage to the operating level required by the IntelliChem controller's internal circuitry. When this component fails, the controller loses power entirely and cannot monitor or dose chemical levels — making prompt replacement critical to maintaining water chemistry automation. The mounting plate ensures the transformer is secured correctly within the controller enclosure, maintaining the factory-specified installation geometry.

Specifications

Pentair Part Number 521335Z
Part Name Transformer with Mounting Plate
Quantity Included Each

Fits Into

Brand Equipment Line Model / Part Number Notes
Pentair IntelliChem Chemical Controller INTELLICHEM IntelliChem Transformer with Mounting Plate

Compatibility is based on Pentair parts documentation and available OEM records. This is not an exhaustive list. For certainty, verify the part number in your equipment's manual or on the original part itself before ordering.

Pro Tip

Before ordering, confirm the part number printed on your existing transformer matches 521335Z. If the controller is completely unresponsive, verify that the transformer is the failed component — check for visible burn marks, a failed fuse, or no output voltage — before replacing. Electrical components inside the IntelliChem enclosure involve mains voltage connections. Replacement must be performed by a qualified electrician or certified pool technician.

CALIFORNIA PROPOSITION 65 WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.
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Pentair Pool Products and Parts

About Pentair Pool Products and Parts

Pentair is often considered the "gold standard" for pool professionals, and for good reason. Founded in 1966 (originally by five inventors making high-altitude balloons!), the company has evolved into the global leader in smart, sustainable water solutions. For the DIY homeowner, Pentair represents the intersection of rugged durability and silicon valley-tier technology. They pioneered the Variable Speed Pump revolution with the IntelliFlo®, saving American pool owners millions in energy costs. Today, their ecosystem focuses heavily on automation, allowing you to control your pump, heater, lights, and chemistry from a single app. While they are a favorite among professional builders, their "EC" (E-Commerce) line of equipment allows homeowners to access pro-grade technology with valid warranties for DIY installation.

Why We Trust Pentair Pool Products and Parts
Energy Efficiency Leaders: Recipient of the ENERGY STAR® Partner of the Year award for over a decade; their pumps are designed to pay for themselves in energy savings.

Smart Automation: The Pentair Home App and IntelliCenter systems offer best-in-class control over your pool ecosystem from anywhere in the world.

Professional Pedigree: The brand most often recommended and installed by pool builders for high-end residential pools.

Eco-Conscious: Dedicated to reducing water waste and energy consumption through "Green" technology innovations.

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