The SITOP BUF1200 Ex 6EP4231-7HC00-0AX0 is the hazardous-area-certified variant of Siemens' capacitor-based 24VDC buffer module. It delivers identical electrical performance to the standard BUF1200 — 300ms of hold-up at 40A, 1,200 joules of stored energy — while carrying ATEX (2014/34/EU) and UL Class I Division 2 approvals for deployment in panels located within potentially explosive atmospheres.

Certified for Hazardous Zones

The Ex certification is the defining feature. In oil and gas facilities, chemical plants, paint shops, and grain handling installations, electrical equipment inside the controlled zone must carry ATEX/IECEx approval. The BUF1200 Ex meets these requirements, allowing short-term power bridging to be deployed directly inside Zone 2 panels rather than requiring a separate safe-area enclosure and long cable runs. UL Class I Division 2 approval extends this capability to North American installations.

Same Maintenance-Free Operation

Like the standard BUF1200, the Ex variant stores energy in internal capacitors — no batteries to replace, no charging circuits to manage, no periodic maintenance. The module charges automatically from the connected 24VDC bus and activates within microseconds when input voltage sags. A green LED indicates ready status. Push-in terminals (0.5-16mm²), 70mm DIN rail width, and -40°C to +85°C operating range make installation straightforward even in demanding field conditions.

Key Decision Parameters

For non-hazardous installations, the standard 6EP4231-7HB00-0AX0 offers the same electrical performance without the Ex certification premium.