ABB - Electrification Signature Partner Distributor
ABB - Electrification 9T51B0187 - ABB's QB single phase transformers feature encapsulated core and coils in a NEMA 3R nonventilated weatherproof enclosure. Knock outs provided on back and bottom. Mounting holes on side for easy access. Wiring compartment includes ground stud.
ABB - Electrification

9T51B0187

UPC: 783173036730


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Specification Sheet

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Overview

ABB's QB single-phase encapsulated transformers, SKU 9T51B0187, are designed for general-purpose power distribution in NEMA 3R non-ventilated weatherproof enclosures. This construction ensures reliable operation in both outdoor and indoor environments by preventing the ingress of moisture, dust, and contaminants. The encapsulated core and coil design eliminates the need for cooling vents, thereby reducing maintenance requirements and operational costs. These transformers are suitable for applications such as lighting, control systems, and small power distribution where dependable single-phase power is essential. The NEMA 3R enclosure provides protection against rain and dust, making it suitable for exposed installations. Knockouts are provided on the back and bottom of the enclosure for flexible conduit entry, and mounting holes are located on the sides for secure installation. The wiring compartment includes a ground stud for compliant electrical connections. Specific enclosure types like ENCX2W117C6 and ENCX1W114C2 are rated NEMA 12/3R and feature pilot device knockout holes and space for control power transformers, while other variants such as ENCX2W113C5 and ENCX2W114C1 are rated NEMA 1. ABB's QB series transformers are manufactured in the US and are built for utility, commercial, and industrial use. The encapsulated core design minimizes vibration-related failures, and the non-ventilated enclosure reduces the risk of internal condensation. This product offers a durable and low-maintenance solution for demanding conditions.
  • Encapsulated core and coils for enhanced durability and low maintenance
  • NEMA 3R non-ventilated weatherproof enclosure for outdoor/indoor use
  • Knockouts on back and bottom for flexible conduit entry
  • Side mounting holes for easy and secure installation
  • Wiring compartment with integrated ground stud for compliant grounding

Specifications

Connection Type
Conduit entry (knockouts on back/bottom)
Connection Type
Conduit Entry (Knockouts)
Enclosure
NEMA 3R
Frequency Rating
60 HZ
Frequency Rating, Maximum
60 Hz
Frequency Rating, Minimum
60 Hz
Height
7.38 in
Input Voltage
277
Insulation
IS-12
Material
Encapsulated Core and Coils
Mounting Type
Side-mounted holes
Mounting Type
Side mounting with knockouts on back and bottom
NEMA Rating
NEMA 3R
Output Voltage
120/240
Phase
1
Poles
Single-Phase
Poles
Single Phase
Series
QB
Special Features
ABB's QB single phase transformers feature encapsulated core and coils in a NEMA 3R nonventilated weatherproof enclosure. Knock outs provided on back and bottom. Mounting holes on side for easy access. Wiring compartment includes ground stud.
Standard
Yes
Temperature Rating
40 °C
Temperature Rating, Maximum
104 F
Temperature Rating, Maximum
40 C
Temperature Rating, Minimum
104 F
Temperature Rating, Minimum
40 C
Wattage
0.25 KVA
Width
6.12 in
Package Dimensions (L x W x H)
4.25 IN x 6.12 IN x 7.38 IN
Package Dimensions (L x W x H)
10.795 cm x 15.5448 cm x 18.7452 cm
Package Weight (Imperial)
10.000 L
Package Weight (Metric)
4.536 kg
A - 15.0 kV bushing

015J0400AN

A - 15.0 kV bushing
O Plus C - 34.5 kV bushing

034Z3000AW

O Plus C - 34.5 kV bushing

Frequently Asked Questions

What type of transformer is the 9T51B0187?

The ABB 9T51B0187 is a single-phase, dry-type, encapsulated transformer.

What are the available KVA ratings for this transformer?

This transformer is available in 15 KVA, 25 KVA, 37.5 KVA, and 50 KVA ratings.

What is the enclosure type for the 9T51B0187 transformer?

The transformer features a NEMA 3R non-ventilated, weatherproof enclosure.

Where are the knockouts located on the transformer?

Knockouts are provided on the back and bottom of the transformer for wiring access.

What material is the coil made of?

The coil material for this transformer is copper (CU).

What is the operating temperature range for this transformer?

The transformer has a temperature rise limit of 115 degrees C and an ambient temperature rating of 40 degrees C.

What is the insulation system class?

The insulation system class is 220 degrees C.

What is the frequency rating for this transformer?

The transformer operates at a frequency of 60 Hz.

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