When it's time to replace a breaker in an electrical distribution switchgear protection setup, you can't just grab any unit off the shelf. You need to match the mounting style, current rating, and overcurrent protection approach that your panel already uses, all while staying within your budget. Two breakers that often come up in this conversation are the Square D BDA36070 and the ABB SACE S3. Below, we compare them directly to help you decide which one deserves the slot in your panel. The decision isn't just about ampacity; it's about whether the breaker actually fits the switchgear you're working with. No two switchgear installations are identical, so the better breaker is the one that matches the existing bus arrangement and protection scheme.
Quick verdict
The right choice depends on your existing switchgear platform. The table below summarizes the key specs for each breaker, and the product notes explain which one fits your installation. Pay attention to the mounting and trip characteristics, not just the current rating, because the wrong connection type will rule out a breaker no matter how many amps it carries. There's no universal winner here-only the breaker that matches your installation. If you're replacing an existing unit, its mounting and part configuration should guide you.
| Feature | Square D BDA36070 | ABB SACE S3 |
|---|---|---|
| Listed price | USD 269.99 | USD 149.90 |
| Condition | New - Open box | Used |
| Current rating | 70A | 100A |
Where each product wins
Where each product wins is clear from their designs. The Square D BDA36070 uses a switch control style with instantaneous break time, giving it a response-oriented profile for industrial settings. The ABB SACE S3, by contrast, is an OEM molded case unit with the AG03018959 part number, which makes it easy to identify as a SACE S3 variant when you're matching replacement breakers.
Product notes
Square D BDA36070 70A I-Line Circuit Breaker
The Square D BDA36070 is a three-pole, 70A breaker with an I-Line connection, built for industrial distribution panels. It relies on thermal interruption for overcurrent protection and lists a voltage range of 551-600V, which suits higher-voltage switchgear. The breaker comes new in an open box, so you get a fresh unit without the sealed packaging. The reason to choose it is the I-Line mounting style and the thermal trip design, making it a direct-style replacement for panels that already use this mounting system. The limitation is the open-box condition: the packaging has been opened, even though the breaker is listed as new. At $269.99, it's the higher-priced entry here.
ABB SACE S3 100A Circuit Breaker
The ABB SACE S3 is a used OEM molded case circuit breaker rated at 100A. It's designed for electrical distribution and circuit protection, and it works with select ABB SACE S3 series equipment. The listed price is $149.90, making it the more affordable option of the two. The reason to choose it is the 100A capacity and the SACE S3 design, which allows it to slot into compatible switchgear as a replacement. The limitation is the used condition: it was removed from a working environment and may show minor cosmetic wear. If you need a breaker for a SACE S3 platform and don't mind some used wear, this is the one.
Final choice by use case
Let your panel's mounting style make the decision. The Square D BDA36070 is the right call for I-Line-based switchgear; the ABB SACE S3 is the right call for SACE S3-based equipment. Both breakers offer concrete value, but they serve different panels and different priorities.
