Fermax Lock Release 540AbD-S Max

Fermax 64551 Electric Lock Release 540AbD-S Max (12Vac Automatic Fail Safe with Override)

The Fermax 64551 is an electric lock release offering automatic re-locking combined with *fail-safe* operation and a manual override, designed for 12V AC systems. Its designation decodes as: 540 series standard body, AbD operation (Automatic Fail Safe AC with Manual Override and Diode - D often implies diode for DC compatibility/protection but primary op is A for AC), S type standard shield, and MAX adjustable latch. **Note: Fail Safe B type operation usually requires DC. The A for AC and b for Fail Safe here creates ambiguity. Verification is crucial. Assuming Ab means Automatic Fail-Safe AC with override:**

Assuming Ab indicates Automatic Fail Safe AC with Override: The 540 body fits standard frames. Ab operation means it is Automatic Fail Safe with manual override. It requires continuous 12V AC power to remain locked. Removing power (e.g., power failure, activation signal cut) causes it to unlock. After power is restored and the door cycles open and closed, it automatically re-locks mechanically. The b part implies fail-safe (unlocks when power is cut). The manual override lever (a implied within Ab) allows setting it to permanently unlocked. The S shield is standard (approx 25x160mm), and MAX provides the adjustable jaw.

This configuration is less common. Fail-safe is usually for safety egress (unlocks on power loss), while automatic re-locking focuses on security after entry. The manual override adds flexibility. **Due to the unusual AbD code possibly mixing AC (A) and Fail Safe (b), it is *highly recommended* to consult the official Fermax datasheet for model 64551 to confirm the exact operating voltage (AC/DC?), the precise fail state (Safe/Secure?), and the function of the D (Diode?) before ordering.**

Features

• Standard Duty Electric Lock Release (540 Series Body)
• Operation: AbD - **Highly Ambiguous Code - Assumed Automatic Fail Safe AC with Override & Diode - REQUIRES VERIFICATION**
• Voltage: 12V AC (*Requires verification*)
• Shield: S Type Standard Flush Shield (approx 25mm x 160mm) - Grey
• Latch: MAX Adjustable Jaw (+/- 4mm adjustment)
• Reversible design (Left/Right DIN)
• Symmetrical body
• Automatic re-locking function
• Manual override lever
• Fail-safe operation (unlocks on power loss - *Verify*)
• **Exact operation (Fail Safe/Secure, AC/DC) MUST be confirmed from datasheet**

Technical Specifications

• Manufacturer: Fermax
• Model Reference: 64551 (Type 540AbD-S MAX)
• Operation Mode: **VERIFY DATASHEET** - Assumed Automatic Fail Safe AC w/ Override
• Input Voltage: **VERIFY DATASHEET** - Nominally 12V AC based on A
• Current Consumption: Check datasheet based on confirmed voltage/operation
• Body Series: 540 (Standard)
• Shield Type: S Type Standard Flush Plate (Grey, approx 25x160mm)
• Latch: MAX Adjustable
• Holding Force: Refer to Fermax datasheet

Dimensions

• Body Dimensions (540 approx): 75mm x 21mm (height x width) - depth varies.
• S Shield Dimensions (approx): 160mm x 25mm (height x width).
• *Consult Fermax technical documentation for verification and precise dimensions.*