The HW1B-V4R is a 40mm diameter non-illuminated emergency stop pushbutton operator designed for use in industrial control systems and safety applications. It features a red mushroom head with a pushlock turn reset mechanism and plastic bezel construction, complying with EN418 and EN60947-5-5 standards for emergency stop devices. The unit incorporates tamperproof construction to prevent accidental contact state changes and is supplied with finger-safe IP20 contact blocks as standard. With worldwide approvals including CE, UL, CSA, CCC (Chinese), and TUV certification, this operator is suitable for integration into emergency stop stations or standalone safety circuits across global markets. The removable contact block design allows for flexible contact configuration options, and the 40mm head size provides clear visual identification in control panels.