| We delivered solid Q3 operating results in both of our segments, driven by our diversified base of end users and OEMs. The semiconductor industry continues to drive revenue for automotive sensors, the Internet of Things, and mobile technologies, while non-semi business is driven by demand in the automotive, industrial, telecom and defense aerospace markets.
Q3 consolidated bookings of $20 million increased 4% sequentially and 13% year-over-year. Excluding Ambrell the year-over-year increase would have been 18%. Consolidated net revenues of $20.2 million came in just above our guidance, representing a better than expected sequential decrease of 4% and an increase of 16% year-over-year. Again, excluding Ambrell, the year-over-year increase would have been 7%.
Our thermal segment was particularly strong. In fact, Ambrell achieved record net revenues for the quarter of $6.8 million, while inTEST Thermal Solutions’ revenue at $7.8 million for the quarter was the highest in more than 15 years. Q3 gross margin was 50% compared with 52% for Q2 and 43% of Q3 revenues were derived from non-semi, compared with 38% in Q2 and 47% a year ago.
Turning to the thermal business. As a reminder, our Thermal segment is the combined business of inTEST Thermal Solutions (or iTS), which serves the test market, and Ambrell, which serves the industrial process markets. We have strategically diversified this segment, resulting in new opportunities in industrial manufacturing through both OEM and end user applications.
This diversification complements our wide penetration into the electronics test market, broadening inTEST's footprint as a provider of highly engineered thermal products for both test and industrial applications.
Solid thermal segment bookings of $14.9 million were up 12% sequentially and 23% year-over-year. Excluding Ambrell, the year-over-year increase would have been 42%. Net revenues of $14.6 million increased 4% sequentially and 27% year-over-year. Again, excluding Ambrell, the year-over-year increase would have been 19%.
Our leadership in thermal continues to increase, with greater opportunities at Ambrell from our OEM partners and end-user projects. Ambrell delivered Q3 bookings of $6.8 million, up 19% sequentially and 6% year-over-year. Orders from end-users and front-end semi OEM's accounted for a third of Ambrell's Q3 bookings with semi, automotive, and aerospace customers driving major orders in North America and Europe.
And Ambrell's record revenue for the quarter grew 6% sequentially and 38% compared to a year ago. Overall, Ambrell was driven by three semiconductor companies who placed orders valued at over $2.2 million. Two automotive companies who purchased EKO systems: one order was with an integrator in Asia for an automotive heat treating application. The second company was an end-user in North America for a soldering application valued at over $100,000. In addition, Ambrell acquired a new customer in the aerospace industry, displacing an induction equipment competitor. The first order was valued at $135,000 for heating and forging applications.
inTEST thermal solutions (known as iTS) delivered Q3 bookings of $8.1 million, an increase of 7% over the last quarter and 42% compared to a year ago, fueled by significant orders from the semi, defense/aero, and industrial markets, as well as a return of strong bookings from the optical transceiver segment of the telecom market.
Chiller orders remain steady, driven by OEMs and a new defense/aero customer. iTS' net revenues of $7.8 million increased 3% sequentially and 19% year-over-year.
Let's talk about some highlights. Bookings for iTS products were driven by orders from two large optical transceiver manufacturers valued at over $1.6 million. In addition a large industrial supplier to the energy sector purchased 12 thermal chambers valued at over $500,000. Elsewhere several major defense companies ordered temperature systems. One company purchased for testing military communication equipment purchases valued at over $300,000 -- and several other major defense companies placed orders valued at $500,000.
Turning to EMS Products business, which serves the automated test equipment market for the semiconductor industry. On the heels of a very strong first and second quarter, we continue to see product demand driven by IoT, industrial and consumer electronics. As expected however, EMS experienced a decline in both bookings and revenue for the third quarter. |