Chain down, chain down - chain snap, snapped chain, chain break, broken chains

One of the links came away from it's pin on the way home this evening. I was standing up really pushing it, the next thing I knew I was battling the bike to stay upright and away from the oncoming traffic. It was pretty hairy for a second but I managed to come away with just a very bruised thigh and cut ankle (why s it always the ankle).
I replaced the chainset about 2 months ago. Does this sound like an installation fail on my behalf? Chain has no power link so you have to fuck about with chaintool when it is on the bike. I was extra careful when I replaced the broken links tonight to make sure there were no raised pins or tight or loose links.

What chain is it?