Bhairava is also known as on as protector, as he guards the eight directions on the universe. In Shiva temples, if the temple is closed, the keys are placed right before Bhairava. नैॠत्यां क्रोधनः पातु उन्मत्तः पातु पश्चिमे । डाकिनी पुत्रकः पातु पुत्रान् में सर्वतः प्रभुः पातु साकलको भ्रातॄन् https://bookmarkport.com/story18228657/how-much-you-need-to-expect-you-ll-pay-for-a-good-bhairav-kavach