The PAD100-PSSA (Single Action) is triggered by pulling down the white "T" bar handle. For the PAD100-PSDA (Dual Action), activation requires lifting the front cover before pulling down the white "T" bar handle. Once the "T" bar is pulled, it cannot be reset without opening the front cover, which also activates the pull station. To reset the PAD100-PS Series, use the Potter WS-93 key to unlock and open the front cover. After opening the cover, push the "T" bar back to its normal position and secure the front cover again.