
B1.03 Comparison
| photo | price | summary | rating |
|---|---|---|---|
![]() | $6.00 | Condition is New – Open box, Square D B1.03 B-1.03 Overload Relay Thermal Unit Heater JL 804, shipping cost = $3.49 | 99.1% |
![]() | $9.99 | Condition is New – Open box, NEW Square D B1.03 Overload Heater, FREE SHIPPING | 100.0% |
![]() | $5.95 | Condition is New – Open box, Square D B1.03 Thermal Unit Overload Heater Heat Coil, New, shipping cost = $5.95 | 100.0% |
![]() | $10.00 | Condition is New – Open box, SQUARE D B1.03 HEATER NSNP, FREE SHIPPING | 99.8% |
![]() | $10.39 | Condition is New – Open box, Square D B1.03 Heater Lot of 2!, FREE SHIPPING | ![]() |
![]() | $7.46 | Condition is New – Open box, Lot of 5 Square D B1.03 Thermal Overload Heater Element - B Style , shipping cost = $5.50 | ![]() |
![]() | $8.95 | Condition is New – Open box, SQUARE D B1.03 NSFB - HEATER ELEMENT, shipping cost = $5.00 | 99.6% |
![]() | $13.95 | Top Pick! Condition is New – Open box, One Square D B1.03 Thermal Overload Relay Heater Element, FREE SHIPPING | 100.0% |
![]() | $9.95 | Condition is New – Open box, SQUARE-D B1.03 HEATER NSNB - HEATER ELEMENT, shipping cost = $5.00 | 99.6% |
![]() | $11.99 | Condition is New – Open box, 2 NEW SQUARE D B1.03 MOTOR STARTER OVERLOAD HEATERS, shipping cost = $3.90 | 100.0% |
![]() | $14.13 | Top Pick! Condition is New – Open box, One Square D B1.03 Thermal Overload Relay Heater Element New In Box, FREE SHIPPING | 100.0% |
![]() | $14.13 | Top Pick! Condition is New – Open box, One Single Square D B1.03 Overload Thermal Heater Element More Available, FREE SHIPPING | 100.0% |
![]() | $1.71 | Condition is New – Open box, NEW! GENUINE SQUARE D B1.03 OVERLOAD HEATER THERMAL UNIT FAST SHIP!!! (A154), shipping cost = $14.99 | 99.6% |
![]() | $10.00 | Condition is New – Open box, NEW SQUARE D B1.03 OVERLOAD HEATER - NEW OLD STOCK, shipping cost = $5.00 | 100.0% |
![]() | $15.59 | Condition is New – Open box, Square D B1.03 Heater Lot of 3!, FREE SHIPPING | ![]() |
![]() | $17.63 | Condition is New – Open box, One Lot of 2 New Old Stock Square D B1.03 Overload Heater Elements, FREE SHIPPING | 100.0% |
![]() | $19.99 | Condition is New – Open box, Square D Thermal Overload Heater Units (2-Pack) NOS You Pick!, FREE SHIPPING | 100.0% |
![]() | $20.68 | Top Pick! Condition is New – Open box, (AN) Square D B1.03 Thermal Overload Relay Heater Element Motor Protection, FREE SHIPPING | 99.9% |
![]() | $24.00 | Condition is New – Open box, 4Pc Set Square D B1.03 Overload Relay Thermal Unit Heater Element 0.74-0.81 Amp, FREE SHIPPING | ![]() |
![]() | $25.25 | Condition is New – Open box, SQUARE D B STYLE OVERLOAD HEATER ELEMENT B1.03 (LOT OF 6), FREE SHIPPING | 99.8% |
![]() | $19.75 | Condition is New – Open box, Square D B1.03 (LOT OF 5) *NEW* Thermal Overload Heater Element, shipping cost = $8.75 | 100.0% |
![]() | $29.95 | Top Pick! Condition is New – Open box, Lot of 2 New Square D B1.03 Heater Overload Relays, FREE SHIPPING | ![]() |
![]() | $23.00 | Top Pick! Condition is New – Open box, 3 SQUARE D NOS B1.03 OVERLOAD RELAY THERMAL ELEMENT HEATER MOTOR CONTROL GO WITH, shipping cost = $8.75 | 99.8% |
![]() | $31.35 | Top Pick! Condition is New – Open box, One Lot of 3 Square D B1.03 Overload Heater Element PP#17-19, FREE SHIPPING | 100.0% |
![]() | $31.35 | Top Pick! Condition is New – Open box, One Lot of 3 Square D B1.03 Overload Heater Element OG#4/5/6, FREE SHIPPING | 100.0% |
![]() | $34.95 | Top Pick! Condition is New – Open box, New Lot of 4 Square D B1.03 Heater Element Overload Relay, FREE SHIPPING | ![]() |
![]() | $35.99 | Condition is New – Open box, SQUARE D B1.03 THERMAL OVERLOAD HEATER LOT OF 3 N.O.S. Free shipping in USA, FREE SHIPPING | ![]() |
![]() | $45.00 | Condition is New – Open box, 4x NOS Square D Thermal Overload Relay Heater Element Unit B1.03, FREE SHIPPING | 100.0% |
| photo | price | summary | rating |
|---|---|---|---|
![]() | $3.95 | Condition is Used, Square D B1.03 Unit Overload Heater Heat Coil, Used, shipping cost = $5.95 | 100.0% |
![]() | $3.99 | Condition is Used, Square D Overload Relay Thermal Heater B1.03, shipping cost = $6.00 | 99.2% |
![]() | $9.00 | Condition is Used, SQUARE D B 1.03 OVERLOAD RELAY THERMAL HEATER ELEMENTS, FREE SHIPPING | 100.0% |
![]() | $9.49 | Condition is Used, Square D B1.03 Overload Relay Thermal Heater Element **Free Shipping**, FREE SHIPPING | 100.0% |
![]() | $9.49 | Condition is Used, Square D B1.03 Overload Relay Thermal Heater Element **Free Shipping**, FREE SHIPPING | 100.0% |
![]() | $9.49 | Condition is Used, Square D B1.03 Overload Relay Thermal Heater Element **Free Shipping**, FREE SHIPPING | 100.0% |
![]() | $9.99 | Condition is Used, Square D B1.03 Thermal Overload Heater Element , FREE SHIPPING | 100.0% |
![]() | $9.99 | Condition is Used, Square D B1.03 260 Thermal Overload Heaters, Lot of 2 *FREE SHIPPING*, FREE SHIPPING | 99.7% |
![]() | $5.49 | Condition is Used, Square D B1.03 B Overload Relay Thermal Unit Heater, shipping cost = $5.89 | 100.0% |
![]() | $14.00 | Condition is Used, Square D B Heater Element Thermal Unit B Style overload, FREE SHIPPING | 99.0% |
![]() | $14.00 | Condition is Used, Lot of (3) SQUARE D Type B Overload Relay Thermal Heaters B0.44 - B88, FREE SHIPPING | 99.9% |
![]() | $14.99 | Condition is Used, SQUARE D B1.03 THERMAL OVERLOAD HEATER ELEMENT (LOT OF 3), FREE SHIPPING | ![]() |
![]() | $14.99 | Condition is Used, 3PCS SQ SQUARE D B1.03 OVERLOAD RELAY THERMAL HEATER A0427, FREE SHIPPING | 100.0% |
![]() | $4.42 | Condition is Used, LOT OF 4 SQUARE D B1.03 B 1.03 B-1.03 OVERLOAD RELAY HEATER ELEMENT USED, shipping cost = $11.95 | 99.9% |
![]() | $5.00 | Condition is Used, Square D B1.03 Overload Relay Heater B1.03 good used condition, shipping cost = $10.75 | 99.9% |
![]() | $8.00 | Condition is Used, SQUARE D OVERLOAD HEATER ELEMENT SIZE B1.03, shipping cost = $8.75 | 99.3% |
![]() | $16.37 | Top Pick! Condition is Used, One Lot of 3 Square D B1.03 Overload Thermal Heater Element OG#41, FREE SHIPPING | 100.0% |
![]() | $16.37 | Top Pick! Condition is Used, One Lot of 3 Square D B1.03 Overload Thermal Heater Element OG#42, FREE SHIPPING | 100.0% |
![]() | $19.95 | Condition is Used, LOT OF (6) GUARANTEED GOOD USED! SQUARE D OVERLOAD HEATER ELEMENTS B1.03, FREE SHIPPING | 100.0% |
![]() | $10.85 | Condition is Used, LOT OF 3 SQUARE D B1.03 OVERLOAD HEATER, shipping cost = $12.00 | 100.0% |
![]() | $20.00 | Condition is Used, Square D B1.03 *SET OF 3* Heater Element, shipping cost = $2.99 | 99.9% |
![]() | $23.99 | Condition is Used, (LOT of 3) B1.03 SQUARE D OVERLOAD RELAY THERMAL UNIT HEATER ELEMENT, FREE SHIPPING | 99.8% |
![]() | $24.99 | Condition is Used, Lot of 4 Square D B1.03 Overload Relay Unit Heater, FREE SHIPPING | 99.9% |
![]() | $27.50 | Condition is Used, LOT OF 12 SQUARE D IC B1.03 HEATER ELEMENT RELAY UNIT B1.030, FREE SHIPPING | 100.0% |
![]() | $31.77 | Condition is Used, Square D B1.03 Overload Relay Heater Element B103 (Pack of 10), FREE SHIPPING | 99.9% |
![]() | $25.24 | Condition is Used, B1.03 Square D Heater 0.65-0.73 FLA (SET OF 3) -- USED -- AS IS --SES, shipping cost = $9.42 | 100.0% |
![]() | $40.95 | Condition is Used, LOT OF 8 SQUARE D HEATER ELEMENTS B1.67, B.22, B1.03, B66, B45, B62, B3.00 B7.70, FREE SHIPPING | 100.0% |
![]() | $44.00 | Condition is Used, SQUARE D B 1.03 OVERLOAD HEATER ELEMENT LOT OF 4, FREE SHIPPING | 100.0% |
![]() | $40.00 | Condition is Used, Square D B 1.03 heaters Qty:6, shipping cost = $6.00 | 100.0% |
![]() | $36.00 | Top Pick! Condition is Used, Square D B1.03 Heaters *LOT OF 3 *USED, shipping cost = $13.05 | 100.0% |
| photo | price | summary | rating |
|---|---|---|---|
![]() | $10.00 | Condition is New, NEW SQUARE D B1.03 THERMAL OVERLOAD RELAY HEATER ELEMENT UNIT (3 AVAILABLE), FREE SHIPPING | ![]() |
![]() | $10.00 | Condition is New, SQUARE D B1.03 HEATER NSMP, FREE SHIPPING | 99.8% |
![]() | $8.00 | Condition is New, SQUARE D B1 03 Thermal Overload Relay Heater Element B 1.03, shipping cost = $3.00 | 99.9% |
![]() | $8.99 | Condition is New, 1 NEW SQUARE D B1.03 MOTOR STARTER OVERLOAD HEATER, shipping cost = $3.90 | 100.0% |
![]() | $12.00 | Condition is New, ONE NEW SQUARE D THERMAL OVERLOAD RELAY HEATER ELEMENT UNIT B1.03, FREE SHIPPING | 100.0% |
![]() | $10.00 | Condition is New, SQUARE D STARTER HEATER B1.03, shipping cost = $3.00 | 100.0% |
![]() | $13.50 | Condition is New, New Square D B1.03 overload heater element Lof of 3, FREE SHIPPING | 99.9% |
![]() | $15.00 | Condition is New, SQUARE D B1.03 HEATER NSMP., FREE SHIPPING | 99.8% |
![]() | $15.00 | Condition is New, SQUARE D 1-B1.03 HEATER NSMP, FREE SHIPPING | 99.8% |
![]() | $15.00 | Condition is New, Square D B1.03, (1) Overload Heater Element- NEW-B, shipping cost = $2.99 | 99.9% |
![]() | $19.54 | Condition is New, SQUARE D B1.03 OVERLOAD RELAY THERMAL HEATER, FREE SHIPPING | 100.0% |
![]() | $19.99 | Condition is New, Lot Of 3 SQUARE D B 1.03 OVERLOAD RELAY THERMAL HEATER ELEMENTS, FREE SHIPPING | 100.0% |
![]() | $20.00 | Condition is New, SQUARE D B1.03 HEATER LOT OF 2 NSMP, FREE SHIPPING | 99.8% |
![]() | $20.00 | Condition is New, SQUARE D 2-B1.03 HEATER NSMP, FREE SHIPPING | 99.8% |
![]() | $16.00 | Condition is New, Package of (2) SQUARE D B1 03 Thermal Overload Relay Heater Element B1.03 , shipping cost = $5.00 | 99.9% |
![]() | $21.61 | Condition is New, LOT OF 4 SQUARE D B1.03 Heater Element Overload Relay. NEW, FREE SHIPPING | 99.3% |
![]() | $15.00 | Condition is New, SQUARE D,B1.03,OVERLOAD HEATER ELEMENT LOT OF 3 NEW, shipping cost = $8.75 | 100.0% |
![]() | $17.68 | Condition is New, B1.03 - Square D B1 Series 0.74-0.81A Plug-On Overload Heater NEMA 8, shipping cost = $7.29 | 99.8% |
![]() | $24.77 | Condition is New, Square D B1.03 Overload Relay Heater Element B103 (Pack of 2), FREE SHIPPING | 99.9% |
![]() | $24.99 | Condition is New, LOT OF 6 NOS SQUARE D B1.03 OVERLOAD RELAY HEATER ELEMENT THERMAL UNITS FREESHIP, FREE SHIPPING | 100.0% |
![]() | $25.00 | Condition is New, SQUARE D 1-B1.03 HEATER LOT OF 3 NSMP, FREE SHIPPING | 99.8% |
![]() | $25.00 | Condition is New, SQUARE D B1.03 HEATER LOT OF 3 NSMP, FREE SHIPPING | 99.8% |
![]() | $25.00 | Condition is New, SQUARE D B1.03 HEATER LOT OF 3 NSMP., FREE SHIPPING | 99.8% |
![]() | $19.99 | Condition is New, Square D B1.03 Thermal Overload Heater Element Relay, 2 Pack, new (L), shipping cost = $8.60 | 100.0% |
![]() | $28.99 | Condition is New, LOT OF 3 NEW Square D B1.03 Thermal Unit Overload Relay Heater Element B 1.03, FREE SHIPPING | 99.8% |
![]() | $30.00 | Condition is New, SQUARE D 2-B1.03 HEATER LOT OF 2 PKG OF 2 NSMP, FREE SHIPPING | 99.8% |
![]() | $30.00 | Condition is New, SQUARE D B1.03 HEATER LOT OF 4 NSMP, FREE SHIPPING | 99.8% |
![]() | $39.99 | Condition is New, NEW LOT 7PCS SCHNEIDER SQ SQUARE D B1.03 OVERLOAD HEATER ELEMENTS P2602, FREE SHIPPING | 100.0% |
![]() | $40.00 | Condition is New, SQUARE D B1.03 HEATER LOT OF 5 (AS PICTURED) NSMP, FREE SHIPPING | 99.8% |
![]() | $35.00 | Condition is New, SQUARE D B1.03 Thermal Overload Heater Unit NEW (6 Pack), shipping cost = $12.64 | ![]() |
![]() | $50.00 | Condition is New, SQUARE D B1.03 HEATER PKG OF 6 NSMP, FREE SHIPPING | 99.8% |
![]() | $50.00 | Condition is New, SQUARE D B1.03 HEATER LOT OF 6 NSMP, FREE SHIPPING | 99.8% |
![]() | $50.00 | Condition is New, SQUARE D B1.03 HEATER PKG OF 6 NSMP., FREE SHIPPING | 99.8% |
![]() | $60.00 | Condition is New, SQUARE D 1-B1.03 HEATER LOT OF 8 NSMP, FREE SHIPPING | 99.8% |
![]() | $84.00 | Condition is New, SQUARE D B1.03 HEATER LOT OF 12 NSMP, FREE SHIPPING | 99.8% |
![]() | $161.00 | Condition is New, SQUARE D B1.03 HEATER LOT OF 23 NSMP, FREE SHIPPING | 99.8% |

Introducing the B1.03 Thermal Unit Overload Relay Heater Element, a crucial component for ensuring the safe and efficient operation of your heating system. This high-quality relay is specifically designed for square thermal units, making it an essential addition to your heating system setup.
The B1.03 Thermal Unit Overload Relay Heater Element boasts a 1.03 rating, which indicates its ability to handle a specific electrical load. Overload relays, like this one, are essential in preventing overheating and potential electrical fires by automatically shutting off the power to the heater element when it reaches a preset temperature or current limit.
This reliable and robust thermal unit overload relay is designed with a high-temperature, low-wear contact mechanism that can handle the rigors of continuous heating applications. The contacts are manufactured using materials that provide excellent conductivity and longevity, ensuring consistent performance and minimal maintenance requirements.
The B1.03 Thermal Unit Overload Relay Heater Element is also equipped with an easily adjustable thermal trip setting, allowing you to customize the temperature at which the relay activates. This feature provides you with greater control over your heating system, ensuring optimal performance and energy efficiency.
Installation of this thermal unit overload relay is a straightforward process, thanks to its user-friendly design and clear, easy-to-understand instructions. The B1.03 Thermal Unit Overload Relay Heater Element is compatible with various types of heating systems, making it a versatile and adaptable solution for a wide range of applications.
In summary, the B1.03 Thermal Unit Overload Relay Heater Element is an indispensable component for maintaining the safe and efficient operation of your heating system. Its high-performance design, adjustable thermal trip setting, and user-friendly installation process make it an ideal choice for both residential and commercial heating applications. Upgrade your heating system today with the B1.03 Thermal Unit Overload Relay Heater Element.
Buying a Square B1.03 Thermal Unit Overload Relay Heater Element 1.03: A Comprehensive Analysis
The Square B1.03 Thermal Unit Overload Relay Heater Element 1.03 is a crucial component in heating systems. Replacing a faulty heater element with a new one can ensure the efficient operation of your heating system. Here is a detailed analysis of the pros and cons of purchasing this specific model.
Pros:1. Reliability: Square is a well-known brand in the heating industry, and their products are known for their durability and reliability. This heater element is designed to withstand heavy usage and can provide long-lasting performance.
2. Safety: Overload relays are essential safety components in heating systems. They prevent the heater element from drawing excessive current, which can lead to overheating and potential fire hazards. The Square B1.03 Thermal Unit Overload Relay Heater Element 1.03 comes with an integrated overload relay, ensuring your heating system operates safely.
3. Easy installation: This heater element is designed to be a direct replacement for most common heating systems. The installation process is straightforward, and the necessary mounting hardware is included in the package.
4. Cost-effective: Compared to other brands and models, the Square B1.03 Thermal Unit Overload Relay Heater Element 1.03 is relatively affordable. It offers excellent value for its price.
Cons:1. Limited compatibility: Although this heater element is compatible with a wide range of heating systems, it may not fit all models. Before making a purchase, ensure that it is the appropriate replacement for your specific heating system.
2. Potential for leaks: Heater elements can sometimes develop leaks, which can lead to water damage and decreased performance. Regular inspections and maintenance are essential to prevent leaks and ensure the longevity of the heater element.
3. Short lifespan (in some cases): Although most users report long-lasting performance, some have reported that their Square B1.03 Thermal Unit Overload Relay Heater Element 1.03 lasted only a few months. This could be due to various factors, such as improper installation, excessive usage, or manufacturing defects.
Conclusion:The Square B1.03 Thermal Unit Overload Relay Heater Element 1.03 is a reliable and cost-effective solution for replacing a faulty heater element in your heating system. Its integrated overload relay ensures safety, and the installation process is straightforward. However, it may not be compatible with all heating systems, and there is a potential for leaks and a short lifespan in some cases.
Recommendation:If you are confident that the Square B1.03 Thermal Unit Overload Relay Heater Element 1.03 is compatible with your heating system, it is an excellent choice due to its reliability, cost-effectiveness, and safety features. However, if you are unsure about compatibility or have had issues with this model in the past, it may be worth considering other brands or models to ensure a long-lasting and problem-free solution.
Details:
Ships same day paid.
specifications indumotorol:
- brand: Square D
- mpn: B1.03
- part type: Heater
- unit type: Unit
payments indumotorol:
- wallet: paypal
- other
- credit card: discover
shipping indumotorol:
- transit: 3-8 days
- type: calculated
- carrier: usps
- service: usps ground advantage
- class: standard
general indumotorol:
- category: Business & Industrial > Starters > Drives > Motor Controls
returns indumotorol:
- time: 30 days
- method: money back
- paid by: buyer
- policy: returns accepted
seller indumotorol:
- rating: 99.8%
- # reviews: 3948
- city: lebanon, oregon
offer indumotorol:
- in stock #: 5
- sold #: 5
- availability: in stock
- started: june 3, 2026
- best offers: true
- prices: $1.71–$161.00
- item condition:
- New – Open box
- Used
- New
- options: ship-to-home
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